I did that a few years ago, but not nearly as bad. The erectile tissue has been damaged. It hurt like hell for weeks whenever I got hard. So much so, that I tried to avoid it. HA - fat chance. Also my dick developed a rather pronounced curve when hard. Slowly - like months - it got better and eventually straightened out. Check out Pyronies Disease.
http://www.impotence-causes-treatmen...-impotence.htm
Let me guess, she was on top, grinding away just a little too forcefully?
take it easy dude