Some medications can cause oral thrush or yeast infection (vaginal) I'm taking an antibiotic for a UTI and one of the side effects can be oral thrush or a vaginal yeast infection, yikes! My son had it when he was about a month old and it was terrible, hopefully you start feeling better soon!
Ive never had thrush,but one of my kids had it. It took 3or4 days after treatment before it went away but the meds they give her took care of the discomfort almost immediately.