Welcome to Just Answer and thanks for your question. You will need to see a private physician in order to get a proper diagnosis. Pain in the ovaries has nothing to do with stomach pain, or pain in the back. Your doctor would need to run some tests to see what is going on. Possibly there is an ulcer, in which case the treatment is antibiotics plus acid reducers, but that does not explain pelvic or backpain. Hospital emergency rooms tend to stabiliize emergencies and provide temporary pain relief, then send patients to their primary physicians for diagnosis.
It isn't really possible to say what it is, but unless the pain is unbearable, you should be able to wait until Wednesday without a problem. It will most likely turn out to be more than one thing, such as ulcer plus reproductive problem. There may be a cyst on an ovary causing the pain, but there is no way to tell until you actually are examined.
Is there any way of knowing whether or not you might have a cyst on your ovaries? What symptoms are there?
Pain is the primary symptom, sometimes along with irregular periods. The only way to know is an ultrasound.