It all depends on what the cause of the problem is. The first thing to do is to establish whether or not there is anything physiologically wrong. For that you need a health check from your GP. Assuming there is nothing wrong then you should go for relationship counselling because the likely cause after being medically cleared is that there is a psychological problem that needs sorting.
After that you need to start looking at drugs to help.
Was this just a spam for an online illegal drug supplier?