Donna,
I'm sorry you're feeling so lousy! And having trouble tolerating the pills you need. Have you tried the suppository yet?
I HATE the ER and it isn't cheap. Unless it's an emergency, IMHO you're better off following up with your primary in the office or over the phone.
To the credit of ERs you can receive care w/o insurance and then agree to pay a small amount a month (ie/ $10/mo).
They can treat immediate nausea in the ER, but they will just send you home with the same pills your primary can prescribed. They can order the same tests that your primary can order.
I hope this is just a cold symptom & you get better soon!