Sudden decrease in erection frequency/ED?(important)

Hey guys,

I'm 18 years old and have been struggling with a new problem for a few months. About 3 months ago, me and my GF (long distance) where in the same place for a week and had a lot of sex. I've never had a problem with erections, and this week was no exception. However, we had been fighting alot about a girl who I had been with before our relationship and she had been being rather unreasonable about this for a long time, and during the last day of this week we had together, I just lost my erection.

I freaked out a little bit, and we parted ways the next day. Anyways, EVER SINCE THEN - I haven't been able to maintain an erection. Masturbation included. I also feel like my erections aren't nearly as firm as they used to be and I feel like I have to keep touching myself/stimulating myself to keep it up.

Also, things that used to get me rock hard don't get me hard at all anymore. I'm back with my girlfriend for the summer again, the trust issues are still there and I'm having tons of erection problems still. I can have adequate sex with her but it's nothing like it used to be because I constantly feel like I might be getting soft. Also, I'm INTENSELY attracted to her so this is not the issue (also masturbation yields the same results).

During oral sex, I don't really have any problems however.

I went to a urologist and he said it seems like textbook anxiety, but I don't understand - Can anxiety about my erections actually reduce my erection frequency? Why do arousing things not get me hard anymore?

I'm a bit of a hypochondriac and my current fear is some kind of autonomic disregulation. Is this how ED as a result of autonomic problems presents (ex. so suddenly?)

Thanks!