L.,
I had a hysterectomy and my bladder "fell"/prolapsed. I also experienced some pain and discomfort afterward and finally went to a urologist to figure things out. Turns out that I am/was/had become (don't know which!) estrogen deficient. I had to start taking hormones and that got rid of the pain.
I still have a prolapsed bladder. I may have to have it fixed someday if or when it starts leaking but it doesn't cause pain. I hope you follow up on this and get it checked out. If it is "merely" a fallen bladder, you might be able to use a "pessary" to hold the bladder up temporarily until you can save enough money to have the bladder lift. Ask the doctor (gyno or urologist) about it.
It will help to ease your mind to see a doctor and get rule out the cancer question. If it is cancer, please read Suzanne Sommers' new book: KNOCKOUT: Interviews With Doctors Who Are CURING CANCER and How to Prevent Getting it in the First Place.
There might be other reasons why you are having pain. The Urologist I went to sent me for physical therapy for pelvic floor strengthening (the good old kegels from birthing classes) and the therapist found many areas of pain in my pelvic area and lower back and helped the muscles "release" and the arthritic-like pain in my hips and lower back eased up greatly.
Unfortunately, the pt would cost money, but if you can go to a place with a sliding fee scale, that would help.
Anyway, I hope you can get it figured out.
A.