My husband still has headaches after sinus surgery 5 weeks ago when CT showed fungi. Says he can smell a stinky smell inside

Great question and a common temporary post surgery effect!  Not to worry, this is commonly seen after sinus surgery.  It can represent an infection, crusting, or recurrence of the fungi.  Continue or restart your irritations, saline spray, prescribed nasal sprays and room humidifier.  If the problem persists or worsens after 3-4 days, please contact your surgeon. You will likely need to be examined to determine the exact cause of your symptoms.  

Most patients have headache after sinus surgery beginning the end of the first week after surgery but ending by the third week. So to have headache at week five is unusual. Because of the odor there is either infection, retained packing material, or excessive crusting. It would be good to continue agressive rinsing several times daily and follow up with your surgeon to clean and assess the surgery site and get cultures if there's evidence of infection.ost of these situations are easily resolved. Hope that helps