Dieting and HRT

My hormones have been a problem for a long time - especially regarding my weight gain and the dr has recently figured out it's because I'm not producing progesterone. Since I've gained 11lbs in the last four weeks she's put me back on the 'diet' (I hate that word, lifestyle changes is normally mine :D) and she's giving me three cycles of HRT and progesterone hoping this will help with my incessant need to eat and you know, fix me!

Anyway, I was wondering if there were any overweight (or recently slim ;) ) ladies out there who have had to diet on HRT and what I can expect or any tips?

Thanks x