Thank you for writing!
An 11.4cm ovarian cyst is pretty huge - far bigger than the ovary itself so your pain/discomfort is understandable. It could resolve on it's own but waiting a year seems a very long time and there is no guarantee it will resolve on it's own - some don't. They can rupture or need removal by surgery. I think you should be as proactive as possible about getting this resolved - an ultrasound next month sounds like a good idea.