Well, have you continued to go to the doctor? What does he say?
Otherwise, it sounds like the doctor suspected infection(s), perhaps epididymitis, urinary and/or prostate infection. If it was an infection, it's possible you still have it. Another visit to the doctor would be in order.
If it's an infection you could use some supplements along with (or alone, but I still think you should go to the doctor) antibiotics. Some good ones are Vitamin C, Zinc, Astragalus, Colloidal Silver, Garlic, etc.
Then perhaps the most important is probiotics, which are good bacteria. Antibiotics kill all the bacteria in your body, good and bad. The good needs to be replenished so you can properly digest, assimilate nutrition, fight bad bacteria, and otherwise be healthy with a strong immune system. You can replenish it by buy a probiotic supplement. Look for high numbers, multiple strains, and enteric coating. Lactobacillus Sporogenes is a strain that reportedly (according to Mercola) has the highest chance of working for the most people. That is to say, not every strain grabs hold easily for every person. However, a multiple strain gives you variety and possibilities.