Zero libido, erection problem, sexual an

Hi...past 5-6 years I was suffering from body mind disconnect i.e not feeling much of emotions whether pleasure or even stress as if body and brain are 2 different things(could be possible as I was involve in entrance prep for years...also once I inhale smoke while trying cigarette then I felt like this)..the most visible manifestation was that after a sexual activity I felt very little if any pleasure in brain..I could only feel it in body not brain as if body and mind r 2 diff things..but last 3-4 months it got worse suddenly when my libido became zero, as a result I find it difficult to get erection .otherwise I am physically and mentally fit..no stress...before 3-4 months my erection was strong and healthy despite earlier problem of body mind disconnect... I am looking forward first to diagnose the problem though proper tests as I have visited 2 Drs but prob is as it is.....I want to zero out that what is the actual problem with me....pls anyone suggest the tests I shud go thru to