My periods act the same way. What I found out is that your ovaries (or ovary, in my case) is making up for lost time. That is why your menses are so long. The light periods are from the depo shot. The way the shot is designed, it is basically putting you in premature stages of menopause. Most women gain weight, terrible moods swings, hot flashes almost in identical patterns with menopause. Your period got heavier in december because you skipped the shot and it was trying to catch up with things. With PCOS, since our ovulation is so untrustworthy, we cannot follow a menstration cycle similar to regular women. Especially if you expect one 4years apart. The WLS has alot to do with it too. When you lose more weight, you will notice your menses will come more frequently and eventually begin to regulate itself. This happens because you are losing weight, and you hormones are neutralizing. That is also why your knuckles and neck are lightening up. Obviously, I'm not a gynecologist. I'm only speaking from personal experience. (Not Pre-op, that is) My initial advice was to probably go back to the pill. It has a much better result, since it's not temporarily putting you thru menopause, which could be harmful for PCOS women. Our bodies are not the same as regular women and shouldn't be treated as such. Most GYN's don't even offer that as an option in my area... Which one, I couldn't tell you. It's different for women. And it's a good idea to talk to your GYN. He/She will have most the answers.

Best of luck,

Whitney