Dude, stay away from anything that makes your piss hurt! Who knows what you're doing down there.
When you take too much creatine, your body pisses out the extra stuff in a form of creatinine. This could be what's happening to you.
My recommendations:
0. Go check for a urinary tract infection
1. Try lower dosage.
2. Sell those pills to your friends and try a creatine monohydrate powder made from Creapure (ie Universal Nutrition, Optimum Nutrition, Prolab all use these) -- it's the most trusted type.
3. Completely try a different form of creatine, such as kre-alkalyn (my favorite, only need 1g as opposed to 5g creatine, less bloat, no loading needed) or creatine magnesium chelate. There's others out there as well
And don't forget to EAT BIG. How much protein per day do you get? Is it 1.5g per pound of bodyweight? How many calories do you get? Is it more calories than you burn? How much fat? Etc...
Good luck!