hey im 16+6 and for the past few days ive been getting a pain in side that sometimes goes down to my groin when i urinate. it kinda feels like cystitis but i dont have that. i went the er and they took a urine sample and i dont have an infection. i do have some scar tissue in my side from an operation when i was a baby.maybe thats stretching.i work at a checkout sitting all day and some time when i sit up i can feel muscles stretching and hurting.am i the only one thats experienced this???