Hopefully it is something easily treated! So many things (mono, strep, swollen glands because of an infection, etc. etc.) can cause a sore throat and difficulty swallowing, I hope it is something other than "just a cold," where they just say "lots of fluids and rest ...."

Bundle up on the couch and I'd recommend just calling the doc the minute they open tomorrow and begging to be seen right away - they usually leave some time in the schedule for "emergencies." If they say they can't see you, ask for a referral to someone who can.