Always So Tired

Lately ive been compltely exhausted, like staying in bed exhausted. Ive been taking my vitaimans and managing my protien but not as well as i should be, they tend to make me sick. My muscles even hurt when i lay on my side. Thankfully i went to my Dr today and was able to explain everything to him, and told him that when i eat, im only able to eat like 4 bites of something and im done; one night for dinner i had 2 brussel sprouts and a mushroom and i was stuffed. My dr and the dietician both told me i have to try to work on eating more they suggested smothies with protien powder which i have to say i actually tried tonight, and i was able to drink it without it hurting my stomach....i cannot wait to get my strength back