performance anxiety or ed?

Hi all,

I Hope I am posting under the right section. I have a question to you guys.

For a long time now (approx. 2 years) I am suffering under performance anxiety. Before I did not had this issue and was always able to perform. I started to use some ed drugs 4 years ago because I had some trouble sometimes when using a condom. It worked fine but I think I got so used to it that I once asked my self, if I can actually perform without ed drugs again. Thats when I started to get those anxieties.

I am in a self observation cycle now where I am always testing my erection when masturbating and I am never sure if I am fine. So now coming to my question to you:
When I am fantisizing to some hot girls (I stopped watching porn) in bed alone I am able to get very hard, I mean 110% hard, unbreakable steel. And I am able to keep it that way when concentrating on my fantasy. Then after half a minute I stop fantasizing and think about something completly off topic (like work, sports or family) and at the same time observing how my erection develops. Mostly it stays at 110% for about 3-5 sec. Then it slowly decreases. For the next 15 sec it stays hard enough for sex (90-100%) but still decreasing. Afterwards I restart my fantasy and after 10 sec I am back on initial hard mode. I am always anxious about the decreasing period, if it is to fast and asking myself if it would be good enough for sex. what about switching positions or whatever. A real scenario might not be so hot like my fantasy and my erection is gone quicker? Did someone of you also observed your erection during masturbation? How is it working for you?

The figures I am mentioning are obviously only estimated and not measured with a timer. Would be interested in your reports to have a benchmark. Went to two different doctors already but they are mostly taking my worries not very seriously as I am in my twenties and in good shape.

Thanks for your replies!