This afternoon I asked my pharmacist to recommend something for sinus congestion, pressure and headache caused by allergy, not infection. I take diltiazem for an elevated heart rate. She recommended an inhaler called fluticasone propionate and a pill , chlorpheniramine maleate. I am also decreasing dosage of a medicine that my doctor gave me to take at bedtime called Lorazapam 0.5 mg. I have been cutting those in half for a week, sometimes taking even less. It makes me too sleepy the next day. Anyway, I have taken the antihistamine about an hour and a half ago, and am overwhelmingly sleepy. I feel so heavily sedated that it is almost scary. Are these medicines interacting to much, or will I simply sleep well?