I'm 22, around 5"7, and very much underweight (112lbs). I'm hypothyroid, a potential case of IBS, and anxiety and depression issues. I've always had stomach pain, and was always thin. My grandfather was a striking image of me, being 125lbs at 19 years old in a wartime photo of an ID card, so genetics may have a roll to play.
I've got self-esteem issues with my weight, really just tired of being skinny, looking ill all the time etc, so I started a weight gain diet. It worked slightly, as I gained like 6 pounds in 2 or 3 days. After having an upset stomach, I paused my diet, and overnight, I lost the 6 pounds. I recently tried this again, gained 6 pounds in a few days, and lost it all overnight. I lose the weight, get back down to 112, and it doesn't go up or down, always 112lbs. My appetite also waxens and weans. I usually only get hungry later in the day...once went until about 10pm without eating, and only ate a donut then.
As much as I would like to gain some weight, it's starting to be more of a health concern. I really don't want to be ill.
Can anyone shed some light?