Hello again BabySub.
After reading the entirety of your post, I can say that your Dominant definitely has some work to do if he intends to keep a submissive; especially one who needs a larger amount of care, affection, and attention than the average submissive as you seem to. I stand by my evaluation that this anxiety issue is not your fault in the slightest, and that while you both could always use improvement, (I could use some improvement as well- no one is ever perfect after all) your Dominant is the one that the impetus of change falls on most fully.
In my opinion, it is not in the least bit Dominant to rely on your submissive for the entirety or even the majority of your education in BDSM. While I'm not suggesting that submissive cannot teach Dominants about their craft, as this is simply untrue, I do believe that in order to be Dominant one must be able to obtain information for oneself, and develop an opinion and unique style from said information. If your Dominant is not trying to educate himself at all, then i'm not so sure that he is as interested in being your Dominant as you are in being his submissive- or he needs a nice, long conversation about how constantly being forced to educate him is making it significantly more difficult to trust and submit to him. As for using the internet as an educational tool, I agree that the internet can be very useful for a starting BDSM couple, and that while you might not have experience in the Scene itself any bit of knowledge does help. I would however recommend that you take anything you read online with a grain of salt (even my own advice) and that you consult with your partner before asking for anything (or creating unfair expectations) and stay communicative about your education. While there are many useful pieces of information on the internet, there are just as many places of mis-information that initially seems credible.
In response to your potential distrust of your Dominant, I can understand every single one of your qualms completely. Personally, I take my promises very seriously, not only in a BDSM context but also in my normal day-to-day life. My submissive, my kinky and non-kinky friends, and my family all know that when I promise something I intend to keep it, and I regard the ability to keep one's promises as a sign of the self-control necessary to be a good Dominant or submissive. The fact that your Dominant does not seem to regard his promises as important, and the fact that he frequently forgets what he has promised to you are not good signs. I would recommend a conversation with him about what a Dominant's promises mean to a submissive, and how his promises make you feel when he makes them, and when he forgets them. If you feel like you cannot depend or rely on him, then in my honest opinion he is not a very good Dominant. I believe that a Dominant must have control over his or her life before he or she can control another's- and it seems that your Dominant does not have control over his life just yet.
As for your Dominant's lack of self-control, again I do not think this a very good sign. I believe that self-control is the mark of the Dominant, as self-control is necessary to properly discipline a submissive without hurting him or her, to exert will over a submissive without doing exactly what that submissive wants (and thus allowing said submissive to top from the bottom), to create and enforce boundaries, etc. A lack of self-control means that he probably should not be disciplining you at all- and that at the very least you need to be able to safeword during punishment to prevent from being injured, or emotionally damaged (like what unfortunately happened during the incident that caused your anxiety). You need to discuss this with your Dominant as well, and tell him how while you would like to let him play with you ( as I assume you would), you are unsure that he will know when to stop, and thus unsure of how safe he is.
I believe that you need to make your qualms with your Dominant very clear to him (if you haven't already), and spell out what you want from him in this relationship. As he is a first-time Dominant, it is very probable that he does not understand what a submissive requires from a BDSM relationship. I will withhold my judgement of him as unsuitable to be a Dominant, but will say that he has quite a lot of work to do to fix his various issues, and overcome his lack of education on BDSM.
Finally, I add a disclaimer: I have very strong opinions about what I think a Dominant should and should not be. Many Dominants that others accept and have a good relationship with do not meet every single one of my qualifications. You may or may not agree with all of them, and either response is more than acceptable. While you may be less experienced than I am, that doesn't make your desires, or needs any less credible than mine. Please, don't feel obligated to agree with every single point I make (not saying that you do, but I tend to make my opinion sound like fact- a remnant from far too many years on the debate team). You know your Dominant a thousand times better than I ever will, and if you believe that he is capable of being your Dominant, then that in my opinion is worth more than every single one of my observations put together. I wish you the best of luck with your relationship and your continuing education in the realm of BDSM.
Best of luck and best wishes
-MJH
P.S. Off topic, but you don't need to capitalize my pronouns unless you want to. I appreciate the gesture, but it isn't needed- I am quite secure in my Dominance