Contractions after peeing!

AC

I was just wondering if anyone else was experiencing really bad contractions after peeing, which last about 5 mins each time. Every single time I go to the bathroom and empty my bladder (especially at night time, which is about 10 times), I get really bad cramp like pains and I can tell they are really strong contractions, and they usually last about 5-10 mins.

I also get the same contractions when walking but they aren’t as strong as they are when I pee.