Ovarian problems 3 yrs after hysterectomy?

I have been in the doctor's office more times than I want to count in the past 3 years following my hysterectomy due to discovery of precancerous cells that moved from cervix into my uterus. I am only 26 yrs old. My concerns are sharp stabbing pain in my right ovary during (has ruined my life with my hubby - who is not very happy with the situation). I have a constant dull achy pain in my side and back all the time. If I ride in a car longer than an hr I get to hurting extremely bad. My doctor has done ultra sounds which show a cyst every time, but he says it is likely a functional cyst and no need for concern. I am very fatigued and I am concerned it may be related to my pain. I am at whit's end with the situation. Where should I go from here? Any ideas if the situation is worth a 2nd opinion by a cancer doctor or stick with my OBGYN? There have been no blood tests. I am tired of hurting and being tired. Any thoughts would be appreciated.