DMage - Sorry you are going through the mood swings. Many cysters do suffer from them due to hormone imbalances. However, if you did not have them before I would think its from the meds. Below is an article that discusses progyluton and PCOS. I hope you find it helpful.
http://www.sharedjourney.com/progyluton-&PCOS.html
There is a social group Caribbean Cysters you can join. I have been dx for years and have found modifying what I eat seems to help with my symptoms as well. Please feel free to PM, IM or email me if you need anything.
I stayed in Montego Bay for on/off over a 3 year period.