Admittedly, I am a tiny person at 5'2'' and skinny...But I will tell you guys a secret, I am actually underweight and I feel awful. I have been trying to put on some pounds because it is effecting my riding. I snuck off on my own to see my doctor and she simply said "There is nothing wrong with you, just stop working and remember to eat lunch once in awhile!" because I have been so stressed lately that I forget to eat...And I just don't get hungry until I have made myself sick, so I have to conciously make the decision to do so. I now have alarms set and meal bars in my saddle bags and backpack 24/7...Right now, I envy you guys who are healthy. My weight issue isn't drastic but it is enough for me to notice how fast I go into fatigue.
I soooo feel for you! Been there before! I'm 5'1 and was 92lb at the peak of my illness (natural weight 106lb), could barely get the energy up to go buy food. My friend was having to muck out my stable and
hers, do feeds, and exercise and deal with all of Brock's antics as I couldn't get down to the stables. Mine was a stress-related illness, and my high stress levels also exacerbated my mental health issues and I ended up suffering sudden bouts of severe depression. Horrible time *shudders*
Have you tried rice bran?
In all seriousness, lots of little meals will help get your metabolism up. Try doing lots of complex carbs like wholemeal bread (decent fibre content too) or brown rice, I find they settle the stomach well. Fish is also good, full of good fat and protein. And yoghurt - especially probiotic. It sorts out any stomach upset from all the stress (I get ulcers) and the weight goes on really quickly. Best not to get the ones loaded with sugar, but if you don't like plain yoghurt, mix in some honey and it tastes lovely. And plenty of milk and lots of dark green veges. Grains like barley and oats will also help keep your energy levels up.
Stay positive, keep eating and stay healthy! I find it a relief to know what the root of the problem is and sometimes being sick can make you even more stressed, and it becomes a vicious cycle, so hopefully you're on track to recover very soon :)