I had did masturbation regularly for 7 days once a day but on 8th day, when i was about to doing sex with my girl friend, i got problem with my penis that it didn't become hard and i couldn't do sex with her. I had felt some stress and might have fear at that moment but after that, still my penis doesn't become hard, even i cannot able to do masturbation. Some time it got boner but only for some seconds. When i googled it, it showed some articles about Ed and impotence... What should i do? doctor