About two weeks ago I was masturbating anally and I noticed I was bleeding from my anus. After 2 days this stopped and all was fine but then I noticed that I would sometimes get the urge to pee when I don't need to and after peeing I would get a strange sensation (not really a pain or discomfort, I'm not sure how to describe it) roughly in the base of my penis. Any ideas what could be causing this?