Thanks for your advice

I hope you dont mind but ive added a post i put up today, its easier to explain the therapy situation. Ive seen a therapist back around 6 years ago for the bulimia, but they were only a certain number of sessions, so by the time it came to me feeling able to open up about my inner feelings the therapy had finished, and recently in january/feb i was able to get some counselling at my docs but only allowed 6 sessions and by the time that ended i was in a worse place than before dealing with all id talked about on my own again...and now im with the drug and alcohol therapy and if im honest i dont know if this is gonna work out....
Hi, ive read a number of the posts on this topic and its like some of them its like its myself talking. It so wierd how there is no one that I no of that has BPD (as far as i know anyway) and coming here its just amazing to feel so connected with a lot that is written, it is most definatly giving me more courage to try and speak out about how i feel as its made me realise im not the only person who thinks and feels like this.
But this is where i feel a bit stuck...well quite stuck. I want to sort everything out once in for all, this has gone on since i was a young age and i need to sort it!! I havent got an actual diagnosis of BPD (that another story), however, I finally have my doctor and a new therapist who have accepted and agreed that this is what i have.
Ive recently started this therapy a month ago, due to my recent drinking the only therapy available to me is through a drug and alcohol service...I was not sure about starting it but i knew i should give it ago, but now a month later im still not sure. On my last session, my therapist told me they mainly deal with changes and dont tend to deal with the past...but this is where im confused, i know that it is through my past that i became the way i am, and my doctor agrees that it is the underlying issues that i need to deal with and have never really done this before. I am not on any meds as my doctor has said that i have tried a number of antidepressants over the years but none have had very much effect and due to a couple of months ago i took an overdose i think she is dubious about perscribing me anything else. Apart from antidepressants is there any other medications available for those with BPD??? From what i have read on the internet there doesnt seem to be.
I want to get my head sorted, my drinking is coming down, at least im not drinking everyday now, but im scared that once i have stopped drinking my therapy will stop. I dont know what options are available to me, i read that their are all these tools that can be learnt in order to help with BPD symtoms, but how do i do this, where do i get this information from??
I know that i need to deal with so many different issues, and i just dont know where to start, i havent got another session till end of next week but i want to at least try learn in the meantime.
Yesterday for example, something happened and inside i just became so angry, felt like i was going to literally explode, i didnt know what to do to calm down, i hadnt had a drink and i made myself not have one either.In the end my reaction was to self harm, surface cut and punched my face some times, i ended up calming. This seems to happen, one distructive behaviour is replaced by another, drinking to self harm. Im scared that like always, when the most obvious symptoms are gone (now drinking, in the past bulimia), i will be expected to be ok, but its the inner feelings that i need to get rid of...and i just dont get how to do it.
I really need some advice please.
Thanks platypus for reading.x