Every few months since I was around 14-15 I got a sharp pain in my lower left abdomen, pain increases if my body is straight up so hunching dulls it. It usually wakes me up in the night, only way to relieve the pain is to pee which causes immense pain between my urethra and lower left abdomen, the pain grows while I urinate but dulls back down when I stop until I can't urinate anymore where it relieves itself for good. I've I checked with local doctors but they are unaware of the issue, got checked for UTI's and STI's, all results were negative. Any thoughts or ideas on what it might be are greatly appreciated. P.S there's no blood in the urine and it is not cloudy, resembles regular pee