Can Ejaculating In Sleep And Erectile Dysfunction Be Treated Completely?

I am a 30 year man but i am unable to do sex . I have sex problem my sex do not erect & able to penetrate. Before 1 year I can do sex but now a days my penis not full erect & not able to penetrate. Sir I am starting sex life before 7 to 8 year and I experienced that my sperm out before sex and erection gone and that time I am not able to do sex so I m trying some medicine before sex and I enjoy sex so always when we were meet I take some medicine and do sex full day sometime we enjoy 2 to 3 time in a day and when she was not near me and I feel for Sex I trying masturbate, but currently I cant satisfied her. Sir my morning erection still gone now a day my sperm fall in night mostly I think premature sperm out and that reason my stamina have very poor now and I am feel very week. So How can solve this problem and how many days required for complete solution. Thanks