I'm sorry you are dealing with this. The good thing is that most ovarian cysts are benign (non-cancerous). And most end up going away on their own. However, yours is on the large side so monitoring it may not be an option.
If you do need to undergo surgery, it is best to have just the cyst removed (cystectomy) so you can keep your ovary and its LIFE LONG job of producing hormones that are needed for every aspect of health.
Please keep us posted. Best of luck to you!