Since beginning to run a/c in bedroom at night my sinuses are painful around my eyes and under my eyes and have post nasal drip during the night that I am constantly clearing my throat. During the day having painful headaches and a slight wheezing cough towards evening. Have tried nasal wash, not working to well and running vicks steam at night. Any suggestions. Had this same trouble last summer when we started running the a/c! I clean the filter weekly but it is an old window a/c. Thank you.