i have a similar problem , but it only occured twice, i get the same feeling of peeing after iam done..but dosent last long..?
Don't get to worried it sounds like you may just have a urinary tract infection(UTI). You will need to go see your Dr so they can get a urine sample. If thats what it is then antibiotics will do the trick, don't delay if you catch it early no big deal.
Good Luck.