Unsure whether my ED is caused by anxiety or PMO

Last night I had a bit of a bad experience with a girl I met at a party and it's left me unsure and concerned about what to do next. I've been struggling with anxiety since early teenagehood but always pushed myself through it and kind of just put up with the pain of it. Over the past couple of years I discovered NoFap and thought it might be a cure, or at least an aid to my problem as I knew PMO was definitely a bad habit of mine.

Anyhow, so last night I got pretty drunk and ended up taking a girl back to my place (being one of the very few times I've been with a girl). During the kissing stage with our clothes on I had a pretty strong erection, this was 9 days into NoFap and I had been quite horny the few days prior. As soon as she took my clothes off though I just lost it, I went limp and for the rest of the night I just seemed to be fluctuating between going limp and getting semi erections.

It was really embarrassing but she seemed okay with it, I was still able to please her and because she was on her period penetration sex wasn't really an option anyway. The thing that's worrying me is that I don't know if PMO really is my problem or whether it's just general anxiety causing my ED. It wasn't like I couldn't get an erection at all because of porn, I just ended up being really nervous when the moment came.

I still plan on continuing NoFap but I don't know whether to perhaps see a doctor about my anxiety because it seems I might be having mental problems beyond that of PMO. Sorry for the long post, just wondering what you guys think I should do? I've been sat here all day thinking about it.

Edit: Ignore my signature counter, it won't let me set the correct number of days for some reason.