Last weekend I had sex with my girlfriend and today I noticed that I had this itchy feeling in my urethra. And at the tip of my penis is a bit irritated. I get this like full or closing feeling towards the base of the penis in the urethra. But most of all I am non stop urinating. I have gone maybe 5 times in the past hour. I have no bumps or cuts or anything like that. What could it be? I am freaking out!