Squishor

It sounds to me like you two have some communication issues. For example, how she says you shouldn't worry about it right now and resolve your other medical issues first. This does seem to show some concern for your health coming first (a good thing), but the problem lies in you worrying about her thinking you're just another guy who wants sex and her creating an environment where you don't feel like you can talk to her. Because to me, it sounds like you're being pretty nice about it. But if you had been able to successfully communicate your feelings to her, the two of you would be busy working on the issue instead of fighting, right? Does she listen to you?

And the other side of the coin is, maybe she's not getting through to you either. Because there's a good chance she may be thinking there's something about her that turns you off and that's why you're losing your erection. You know how people can be so insecure - maybe she thinks you secretly think she's ugly and gross, and she's scared to talk about it.

I'm trying to give her the benefit of the doubt but then again when you say she yells at you for it...I dunno, that's pretty bad. I've occasionally encountered penises that wouldn't stand up and they responded just fine to patience and understanding, not yelling.