My daughter has been sick off and on for a few months now and was sick (AGAIN) last week.
We took her to the doctor and was told that she now has gastroenteritis and they checked her blood due to her being so exhausted and VERY, VERY pale....we were also told that she is anemic.
She is now on a vitamin with iron and we are trying to get her to eat more green veggies (which is tough because she doesn't like them).
I hope you are feeling better soon....take care of yourself! The only things I know to suggest are what I wrote above.
Hugs!!