Erectile diffusion, sexual disorder.

Hello sir, I am also suffering from low blood pressure. But the serious problem is I am facing sex problems. Like I can’t hold my time and cum in just few strokes only Just in few seconds . After cum my body got extra warm. And I am suffering it from long time. After talking extra time pills I was good in sex but I want permanent solution of this. And I also do proper workout everyday but still facing the problems. I am stressed that how can I fix it my health. I feel shamed when I go on bad. I m suffering this from last 4 or more years. I am Not married but I have a girlfriend but she is not satisfied with me. I want a proper diagnose of this problem so that I can live life without any stress. And after sex I fill like fever and few online site suggest me for the surgery.. please someone provide me proper guidance so that I can cure my problem. I feel Alone because I can't share these things to anyone. Please provide solution and proper way of treatment. Thank you...