have u seen DR? things could be twisted up in there cutting circulation. but, a week erection is usually due to anxiety. u can see a masaje(?) therapist to relax you, or get a rub down from ur partner. but, getting all frustrated over a weak erection is going to make it weaker. relaxing will also help the premature ejaculation, or u can try wearing 2 condoms to desensitize yourself. i hope you have a patient and understanding partner, because their frustration will make it worse yet.
try to make the time about being close, nothing more. what happens happens and what doesn't doesn't. no pressure. things should improve.
I suffer from almost the same thing. Penis curved to the left, tend to ejaculate quickly and have a weak erection. Add to that low sexual interest. I am a bit older though (46). Some of my symptoms could be associated with antidepressants I take. I am about to switch meds to see if that helps. Also I got my testosterone level checked and turns out I'm low. ABout to start Androgel 1% for that. We'll see how that goes. As for the curve in the penis, It doesn't prevent me from having sex so I plan to leave it alone. If yours is painful or impairs your functioning you should talk to your doc. I have heard of surgery to correct it, but I heard the surgery can reduce the length of your penis.