Doctors say: Men have several night-time erections. On average, a healthy man has 3 to 5 erections during a full night's sleep, with each erection lasting 25 to 35 minutes.

This is an answer on your 1 question. I think the main problem with your psychological state. Most diseases come from the head. You can try quality viagra and analyze your behavior during sex. In the same time, a physical condition also can affect your erection. And don't worry about the relationship. If a girl loves you she supports you