Local pharmacies are opening up their own "urgent care" and walk-in clinics right in their stores. The CVS pharmacy here in GA has one. I'm not sure if they'd write a prescription for something like this but it's worth a phone call to find out. It might be less expensive and time-consuming than the ER.

If you're on Ty a phone call to your Neuro might be helpful. He might have a suggestion as to which med is preferred over another.

I hope you feel better.