I went through your same routine and am trying to figure it out as well. I started Lisinopril in Feb 09 for a similar BP as yours I've had for years. About 3-4 weeks later the night coughs started. I went to an ENT who diagnosed me with esophigal acid reflux. After a short stint taking an Rx my HMO would not cover, my primary Dr. prescribed me Protonix which helps, but I have to supplement it with chewable Papaya enzymes to get a fair amount of sleep. My cough is mainly during sleep when lying down. The cough is generally caused by a sharp sticky feeling in my throat. If you find any more info to help your symptoms I'll be interested.
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