Help with bladder/abdominal pain?

I (16F) have been dealing with bladder and abdominal pain for over a year, but I've always assumed it was frequent UTIs. No treatment with multiple antibiotics for months. My urine comes back clear, doctor says maybe IC? Not been officially diagnosed since no urology places can see me until April. I got an IUD about a month ago and since then it seems like my bladder burning/frequency and general cramping pain has gotten so much worse. Baths & heating pads do not help anymore. I'm staying hydrated but I feel that now I need to find treatments. Any help???