There is a woman in Yahoo Adult Metal Chelation who is using something else, I think prednisone; however, she's in bad shape. She is also taking medicine to support aldosterone. She is still really fatigued and really struggles to do HM detox.
A close friend also gained similar weight in a similar time period. It continued to 15lbs over additional weeks.
She cut back from nearly 15mg to 5-7mg per day plus supplements, esp pregnenolone.
Many people report really nice gains in a short period of time from HC.