Now, I haven't talked to you or examined you, and all that I know is what you wrote, but I'd say that both these doctors could be right , and you have many options . Swimming might be a better idea, for now. Most of the time, these kind of back problems go away. Excersizes to strengthen back and abdominal muscles. Good back support in bed and in chairs.
Physical therapists can help a lot.
So can chiropractors. A couple little ones. Slighty Increased surgical risk because of longer surgical time, and slightly higher possibity of problematic blood loss, as well as an accidental urinary tract or bladder injury. There is also some small chance of poor vaginal healing after cervix removal, and of a shorter vaginal length after surgery, interfering with sexual intercourse. Not because they are minor, but because they are extremely unlikely to happen, whereas cervical cancer is one of the more common cancers in women.