Focus on optimal nutrition and try to be a bit more active - that should up your metabolic rate.
Forget about losing weight for the time being and focus on healing your body and your metabolism first and foremost.
The weight loss will follow later and believe me, it will feel relatively effortless.
F 5 ft 3. HW: 196 lbs. Primal SW (May 2011): 182 lbs (42% BF)... W June '12: 160 lbs (29% BF) (UK size 12, US size 8). GW: ~24% BF - have ditched the scales til I fit into a pair of UK size 10 bootcut jeans. Currently aligning towards 'The Perfect Health Diet' having swapped some fat for potatoes.