Can a small ovarian cyst that hasnt ruptured cause discomfort, nausea, pelvic, and lower back discomfort, pain in upper legs, can't eat, freq. Urination?

Yes. Sadly, an ovarian cyst can cause discomfort, nausea and pelvic pain. Pain in the upper legs and frequent urination with a small cyst is likely something else. You may have a bladder infection on top of having a cyst? If you've lost your appetite as well i would see a doctor for an evaluation as you wouldn't want to miss something. Best of luck!