Testicle size variation. My sexual life.

I am 26, before 4 years I got a pain in my left side testicle over mid night and that pain was killed. So, I consulted local doctor at mid night, they put injection pain was slow down after that I slept. Next day morning my testicle was much bigger to compare another one. So, I was shocked and consulted to another local doctor, he said some kind of mosquito bite you and he put injection and gave tablet for that and he was instructed cover your testicle with cloth like tie with cloth tighter then only size was reduce. So, I tied with cloth and pain was gone and size was reduced. And after 1 year that testicle was very very small in size. If suddenly I saw means there is only one testicle was present like that only and that testicle size was 0.4 cm. Still I have this problem and one more thing some time, if I see some adult movie means that testicles give a slightly pain. So, what to do doctor...is there any problem in my sexual life.....please give solution for this doctor...