Patient: I have had severe allergies for most of my life, plus chronic sinusitis and asthma. I just had my sinuses operated on, and have started to feel wonderful.However, we replaced our old furnace with a brand new one plus ductwork, and duct cleaning done two days ago. For the last day I have been feeling sick and sluggish again, like I did before my sinus surgery.Is there a TRUE allergy to heat? –Because I feel drowsy, lethargic, and very slow since the heat has been turned on.Thank you, Phyllis