I Have Been Sick For 5 Weeks Finally Went To

I have been sick for 5 weeks finally went to an ent doctor he said it was allergies to take Nasacort. took for 3 days and seemed to open me up but 4th day ended up with severe redness in throat which traveled up to the roof of my mouth moving towards the front of my mouth almost looks a little like red blistery. sinuses are draining like crazy have a headache and a low grade fever of 99'5 could this be caused from the Nasacort not sure what to do