Other than sucking an ice cube or sipping icey water, I can't think of much that would help. Anti-inflammatories perhaps would help but are bad for all us "gerd" folk! I would see a doctor, if it doesn't go very soon. Maybe if you're GERD etc is under excellent control you could cope with taking a Brufen type drug for one or two days - but definitely check with your doctor first! I think it can be caused by reflux, but equally it could have been caused by the procedure - especially if it's a new symptom. If it's not going, see your doc to make sure there's no infection.
Sounds horrible though - poor you!