My stomach hurts when I lay on my stomach. My head hurts a lot too. I've been cold lately. I've been tired too. I yawn every second.

Could be a sleep dis. Your evaluation will include a systemic evaluation, a sleep evaluation, a lab evaluation to look at thyroid, other metabolic, inflammatory or other clinical problems. Despite you not feeling well your physician will have to put each of these issues into an equation to try to help you.