I have had the same problem with my bladder. I have ureter endo and if I hold my pee too long (like 30 minutes) I start to feel very ill. I ALWAYS feel like I have to pee. Also my whole urinary tract seems to hurt when trying to pee. It's very hard sometimes to start peeing. I get trembly feeling and it burns a bit when I finally do pee. I get uti's frequently and the only thing that really helps me is drinking ALOT of water and nothing else, sometimes ibuprofen, apple cider vinegar. But currently I'm waiting for an appointment to talk about if my ureter is becoming obstructed. My pain feels like my left ovary when I'm having this problem.

Could be a bladder infection?