I am 22 years old and all of a sudden one month ago, I couldn't feel orgasm during masturbation. Everything was fine even on the day before. Even the day before the problem began I had masturbated and got an orgasm. But ever since that day I have no orgasm whenever I masturbate. Now after a month I am even noticing that I can't maintain an erection without constant mental thoughts about sex. Previously I could maintain an erection for about 30 secs even without any thoughts. Now I lose my full erection within seconds. But can get it back again if I start thinking of sex. Why did this problem happen all of a sudden? I did not have any injury or anything and don't have any other health issues. This problem is also causing so much depression.