Starting about 5 weeks ago, I woke up tired, then had migrain, never had a head ache like this, behind the eyes and wrapping around my head like a band clamp. went to my doc, got antibiotics for sinusitis, went away, back in a week with vengance, round 2 antibiotics, better while on them, 10 days later, again with the sinus pressure, went to walgreens nurse practi on Saturday, round 3, finally went back to doc, no more infection, just inflammation, 6 days on prednisone, 2nd day on, felt fine, normal, ended that a few days ago, now glands in throat feel very swollen, slight stomach ache, mild sinus pressure...chills... what is best guess?