No personal experiences with Megace but know that others have and hopefully they will chip in with experiences etc about it. I know as well that there are quite a lot of postings on the site that members have made over the years and the search forum function should throw them up.
I have a few links for you from here in the UK that hopefully will give some more info for you –
I know there are people experienced or knowledgeable about Megace which is supposed to stimulate appetite, therefore more nutrients and weight for the individual.
Would there be a reason that a doctor would not suggest it? Bad for liver enzymes, tumor, etc..?
I am not certain how quickly it works and if it can be a temporary help without using the drug long term for major side effects.