Sleepless, premature ejaculation. Me!

I have been suffering a discomfort feeling inside penis, pelvic region since 4 years i can't explain what kind of feeling it is!it is not pain but like similarly pain.this uncomfortable feeling has many types.when this pain comes i begin to start bad sexul thoughts and i am unable to concentrate and i gets angry,urge to urinate.such kind ofunusual feeling inside the penis leads me anxious state.i have very difficult with sleep.i don't know from where this pain like feeling comes it may be urethra,bladder but i can explain it is inside the penis some times i feel at the back top of the penis some times under testicle.due to this problem i can't improve my health conditions.For better diagnosis i have no blood in the urine, no fever.my weight gradually decreases.i have very sexual instrunsive thoughts due to this cause.can u help me regarding this issue.