Numb Penis Shaft

A little history: I'm a 24 year old sexually active male. I got circumsized at 19 with no complications.

Since march of 2008, I had a problem.

I was about to have sex with my girlfriend and I was unable to get fully hard. This was the case for the whole day. The next day everything was fine. I went to see a doctor just in case and he prescribed viagra (which I didn't use) and told me not to have sex for several days.

About a week later, my gf and I were about to have sex when I noticed a numb patch on my shaft. I put an ice cube on that patch and didn't feel anything.

I freaked out, went to see a urologist. They diagnosed me with prostatitis, prescribed antibiotics, told me I would get better and not to worry. I also got tested for chlamydia and gonorrea. Second day of antibiotics I felt a burning sensation but it went away the same night, I figured the antibiotics were working.

Next time I went to get the results, I was negative for STDs but my shaft was still numb and it had a portion that felt like a different consistency than the rest of the shaft - and it was numb.

I went to see several more urologist. I got tested for prostatitis again (via finger) and was told I had a healthy prostate. I also got tested for peyronies disease and no calcium was found in my penis shaft.

However, my penis shaft has been getting more and more numb (and not just in the place that has that weird consistency which now sort of looks like whiter-colored half-ring, it doesn't extends all the way around). In fact, I don't feel pressure on my shaft at all. I still have mild sensation on my skin - I can feel scraping and temperature in most places on the shaft.

When I get stressed (like sleep deprivation, I feel my muscles (the ones controlling the penis retraction) contracting involuntary as well.

Also, even when I'm not doing anything sexual, my penis shaft still feels hot like it has a fever.

Any help would be appreciated, I was sent to go to a neurologist but the one I went to said he never heard of anything like that and just wanted to do some tests.

Please help! Does the hot shaft mean I still have some sort of infection? Do the involuntary spasms mean I still have something lingering in my prostate?