Hi, am an African man in the middle twenties, I have been experiencing inability to have a a early morning Bonner or erection and this have been happening for the past 2 years. Tho I do HV erections anytime I wanna have sex with my girlfriend but I hardly last 5 minutes.. I HV tried various drugs and herbal concoctions, it doesn't change my situation... Pls I kindly need advice on what to do next.