Propecia induced performance anxiety?

[Orca]

Hey, I've been on propecia for about a month, and up until now experienced no sides.
Last night however was the first time having sex in this month, and I couldn't perform. I still get morning wood, I had successfully mastubated just hours before, she could get me rock hard in 10 seconds with oral, but as soon as it came to actually sticking the damn thing in, he was like NOPE and went all floppy.
I did feel a bit worried that the propecia would stop me peforming, but I didn't realise I was that anxious about it! I have experienced performance anxiety before, when I first lost my virginity, but it wasn't a problem I thought I'd ever get again. I can see this being a self-fulfilling prophecy; Since it happened once I'm just gonna worry next time and then stress is gonna make it happen again.

The sensible part of me says it's not the propecia, and I'm just submitting to the fear mongering I have read about propecia, but it is worrying me.