If it's any consolation, I'm alternating but tend toward C, and am currently working on LOSING a ton of weight. I am presently 183 lbs and the same height as you. I used to be 110. i remember those days well too, and that's my goal too! So here's to you and me meeting at 110!
By the way, I far prefer my D days to my C days. Don't know why-I guess being empty feels way better than being relaly really stuffed.