Therapy-Induced Anxiety?

I just began attending therapy for the first time ever a couple weeks ago, and right after the first meeting, I felt great! I felt like I had gotten so much accomplished, even in such a short period of time!

However, about a day later, I began obsessing over the things I said, whether I was clear enough when discussing feelings/symptoms I've had. I also remembered answers to questions she had asked me that were better/more accurate to me than the ones I initially gave. Basically, I just felt a whole bunch of anxiety about the things I wish I'd said/clarified better. One of my biggest fears in therapy is to phrase something in an odd way, which would result in me getting misdiagnosed, etc.

Is obsessing over things you said/wished you said a common thing in therapy? Or is it something that improves later on, as you get more used to therapy/your therapist?

Therapy is a pretty open and vulnerable position to be in, it's pretty normal to have anxiety about it. Especially if you only just started a few weeks ago. You have a new person to get used to and you are seeking help from them so it's natural to be anxious about giving the information about your symptoms, wanting to be clear and wishing you'd said stuff differently. If you have anxiety about being clear about your symptoms, you can just tell your therapist that and they can help you work through those feelings of anxiety.

You may keep experiencing anxiety about your therapy for a while or you may not, everyone is different. If you get to a point where you feel you've explained your symptoms and feelings properly and have a diagnosis that you feel is right, you may still continue to have some anxiety about therapy, it may just be about different aspects of it than what you had anxiety about initially. Personally, I often feel anxious about what my therapist thinks of me and my problems, whereas initially, like you, I worried that I wouldn't explain my symptoms properly and would end up with a wrong diagnosis and not getting effective treatment as a result.

Anxiety about what the therapist thinks of you, or really any other reaction you might have to the therapist is called transference. This basically means that you are transferring your feelings about another person or situation onto the person of the therapist. Part of the reason therapy can be so helpful is because it can help you work through your issues by the therapist essentially stepping in a safe person that you can direct your feelings towards that may have otherwise been directed at someone else but have never been expressed. I'm not sure I really did a great job explaining that so I'd suggest just using a search engine to look up therapy transference.

All the best! I hope you keep finding it helpful