I agree. There are a number of things it could be, from yeast overgrowth to GERD to infection. Get it checked out.
SLE diagnosis 10/05 now changed to RA 3/06, Endometriosis 5/05, PCOS 1990
Meds: Metformin ER 1500mg (PCOS); Loestrin BCPs (Endo); Methotrexate 15mg (RA); Metanx 5mg (RA); Orencia 750mgs (RA); Lunesta 2mg (as needed); Prevacid