I am unmarried male who had a healthy sex life. one month ago i had sex with my gf, it was normal when i did for first time and after some hour i tried for second time but i could not have sex due to soft erection. I panicked. i thought what happening to me and at night i tried masturbation and it was normal and after 3 days I tried masturabation but could not do due to erection problem. since then I have lost interest in sexual activity. I could not masturbate. Erection occurs sometime but not for long. and after knowing this problem, my legs and hand are started hurting. I am in stress. Please help.