Would check for strep throat
, even if not symptomatic, or mycoplasma infection
may also be TMJ or bruxism ( grinding teeth
at night ), reflux
check for h pylori as well, check ESR
, CPK, ANA
for autoimmune process, though less likely check EKG, troponin
, check CXR and for lymph nodes / thyroid would follow up with doc ER today.