I masturbated hard yesterday and for quite a long time as well lol, about an hour after I finished I went to the toilet and noticed my penis was swollen, after examining I realised it was just my foreskin, I went on line and found a couple of people with same issue and figured it was just from the friction or whatever, today the swelling haise gone down and there are some stretch marks at on my foreskin. But I can't get a full erection and keep it, I always get an erection really easily but now it's taking me ages and it's hard to keep it up, should I get this checked out or is it because I'm over thinking it? The swelling really scared me so could it just be that I'm thinking about that and can't get turned on?