I do not take much medication-one headache pill will always take care of my issues. I started a Zpak yesterday, 2 pills, then one pill today and the next 3 days. The feeling of nausea, and headache is keeping me unable to do anything. The pain is causing my sleep pattern to be broken. How bad would it be if I broke the pill in half the next 3 days. I am 73, and 200 pounds. Unable to eat much because of the feeling of nausea. I am a diabetic, and take a thyroid pill due to removal of my thyroid gland.