Did they say if you had Endometriosis or anything else? Just the cyst?
I had surgery on Feb 28th and I feel down a bit, tired, emotional etc. I think its because they rattle around in there and the ovaries might get moved around etc and it could temporarily change your hormones. It will take a couple of weeks to recuperate so be patient on your self and please rest for at least another week.
Laps are a very normal procedure even at your age so please don't worry as cysts happen all the time to many different women.
It could be totally hormonal. When a pal of mine was on estrogen for IVF, she cried at cat-food commercials on the radio. It's possible that the cyst had been doing something to the hormone messages coming from that ovary, and now with it being gone, things are doing to be kind of wacky until your body gets settled down to the new reality. Your other ovary will be taking on the job of ovulating each month, as opposed to the every-other-month schedule it used to have, and that also might be a bit of a hormonal roller coaster at the outset.
Talk to your doctor about it, and try not to worry. My sister lost an ovary to torsion when she was 17, and it never slowed her down. She got pregnant on the first try, she had normal periods, she hasn't gone through menopause yet but seems on all the normal time trajectories. You should fine.
Again, if your body doesn't settle down by the next period, call your doctor. They can run some hormone tests.
Take care! I'm glad they got the grapefruit out. :)
(((HUGS)))
Annie