Would like to gain weight

This is the ONLY group I found of weight gain,l there aren't any other groups, every other group is for weight loss. Seriously??

Anyway, I would like to know if anyone knows a great healthy way to gain weight. I have tried eating and eating, I have tried weigh gain and protein shakes, I had 2 kids, my son in 1999 and my daughter in 2007. I lost ALL the weight within 3 months because I have a very fast metabolism.

Honestly, I am fine with my weight because I am short and petite, but I would like at least 5-10 more pounds, it wouldn't kill me. I am 98lbs now and I have been since I was 17 or 18, same and I am 32 now.

Thanks!!!