Suggest Remedy For Nasal Bleeding, Headaches And Tiredness

What causes your red blood cells to get smaller and smaller? I am also suffering girl blood from my nose, headaches, and severe tiredness. I fall asleep repeatedly daily. While driving and working and it's getting very dangerous and I don't know what's causing it. My blood work keeps showing that my red blood cells are getting smaller. What could that mean. I feel worst and worst, and so tired.