ive had the very similar symptoms as well. sharp pain then lead to burning pain after ejaculation. lasts for about 30 minutes .the pain slowly goes away everytime i pee. though just a decent amount. ive had this for almost 12 years now and the pain still sometimes comes up.
anyhow.from what i learned this pain always occurs when i ejaculate facing upward. and never when i facing downward. oh, i went to some urologist and too, no std, uti, prostate problems or stones. some of the doctors even reccommend me to go to shrink instead. i think this has somethin to do with the muscle, becouse it feels theres something "stuck" in there and forcing us to pee, i dont know. if anyone has finally figure it out pls post here.
thanks