expressions about not feeling well and expressing sympathy

source: EFEnglishtown
# expressions about not feeling well
--I'm feeling pretty lousy / awful.
--I feel sick to my stomach.
--I thought it might be food poisoning.
--I'm afraid I won't be able to make it to work today.
# expressions of sympathy
--That's terrible! You must feel awful!
--Oh, that's terrible. I'm sorry to hear that.
--You should stay at home and take it easy. (relax and rest)