Ok, I was checked for STD's and came up clear. I took the meds they gave anyway. I felt normal. However, once I could masturbate, I got carried away. One day I was sore from the day before. Worn out, but I did it anyway. EVER SINCE, my penis always feels like there's something in the tubing. Like some semen that is left in there. I squeeze and look, but nothing is there. At times I may feel a slight irritation in my urethra, but it's gone. The same thing happens when I urinate. I stopped masturbating for a week or so, and felt better. However, I decided to test it and masturbated again. Now, I have that feeling again. What the heck is wrong with me?

Ask your doctor.