it does sound like you've had a rough ride but your weight loss through it all is great.
since I've been grain free I've come to realise its a terrible food source for me.
weekends are also difficult for me so I plan everything we eat and make sure its really all things we enjoy.
i eat VLC and my carbs are between 40-80. in the week i eat 40-50 at the weekends I eat around 75-80. those extra 30 carbs make a real difference to making a weekend special but I still stay in ketosis. I also eat some selected non primal foods.
PCOS is something Ive had problems with all my adult life,so sympathise but for me it was at its worst when i was heaviest. Have you considered using a diaphragm - i know its less spontaneous but it doesn't mess with the hormones.exercise is good though, try the 4 things in the PBF guide and walk more-you don't have to be a gym bunny