What Is The Treatment For Recurring Blisters On The Inner Thigh?

I been to three different doctors. All of which my test came back negative. I was tested for trichomonis, hiv, herpes, siphylis, clamidia, ghonorhea and hepititus. ALL....negative. But, Istill getting an irritating reocurring pinch in my Utract. This morning I actually bled from my Utract. I also get reocurring blisters on my inner thigh. Getting an erection is dang near impossible. If I have so many symptoms why is it no doctor can tell me whats wrong.... Signed Frustrated.