K.S.
Yes, I have this issue about one week a month. It is most likely due to your hormone levels being a little wacky. I, too, gained weight at first and couldn't figure out why I was hungry all day every day. Now I only get it that week prior to my period, but it sure is annoying. It seems to help if I add extra lean protein to my diet. Also, sugars can make it worse, so you may want to stay clear of that temptation. One thing that really helped me is taking a magnesium supplement. They are really cheap and have tons of health benefits, including balancing out your hormones. It helped a LOT and I highly recommend it. It will also help your constipation issue and the digestive problems that may be contributing to it. Good luck:)