What Causes Headache With Stomach Discomfort?

I have had a very bad headache all day. I feel sick to my stomach. I have taken excedrine, tylenol and a 50 mg Tramadol (which usually knocks me out) and nothing has helped the headache. for the past few weeks not everytime I eat lunch i feel sick. I'm tired all of the time, and it seems no amount of rest makes me feel refreshed.