Your symptoms sound closer to a urinary track infection especially the feeling that you have to go pee all the time but don't really have to go. It could be from masturbating with unclean hands. Bacteria can get pushed into your urethra causing a UTI. That's one of the reasons after PIV it's wise to urinate to help flush out anything that might of traveled up the urethra. You might want to try doing peeing after you masturbate to see if that helps the situation.