Related to sex problems

Patient: Hi Doctor i am Narindra Patel,Age 25, i have problems regarding erection, i don’t get proper erection and even if it happens it lasts long only for 2 to 3 minutes, that is happening from last two years, what can you suggest??

Symptoms: I am suffering from kidneystone problems as well and also gained lot of weight in last 2 years approximately 91 kgs now