I'm sorry you're getting the brush off from the medical profession. That shouldn't happen. I'd fight to be heard and keep trying to get in to see someone until you find someone more adept at handling these issues.
That said, this won't limit you much from finding women to be with as much as you think, as long as you are enthusiastic about women. There are women in who would rather not have penetrative sex. Fingers, toys, etc. are gentler on the body and produce perfectly adequate orgasms, and if a guy enjoys doing this, the woman will probably go with it. I realize this doesn't do much for your orgasm, but it should help take the anxiety out of the issue of not staying hard for long. What you do when you aren't hard can be as exciting for your partner as what you used to do when you were hard.
Again, that said, especially because of the pain when you have an erection, try for a better doctor if you can. A therapist would be good also.