How long have you been Primal? Have you had any signs of carb flu?
And you have a great avatar.
By the way, Primal will work without doing exercise, at least it did for me. Not sure the OP should be working out at this weight. Just walk around a little bit.
5'0" female, 44 years old. Started Primal October 31, 2011, at a skinny fat 111.5 lbs. Low weight: 99.5 lb on a fast. Gained back to 111 on sugar cheat. Currently fighting off sugar/candy cravings with bulletproof cocoa and a little rice.
I (try to) follow by-the-book primal as advocated by Mark Sisson, except for whey powder and a bit of cream. I advocate a two-month strict adjustment for newbies. But everybody is different and should tweak Primal to their own needs.