[MargaretR]

If the headache meds you take contain codeine, that could be giving you nausea. I was addicted to Solpadol (prescribed for osteoarthritic pain) but went cold turkey when they started to make me throw up (I never took more than prescribed dose)
Prescription meds can make you ill!!
Always check out for side effects on the web
Good Luck - sounds like you need some.