... lisinopril 1 per day. Each day I took it I felt worse and worse. Severe headache and intense muscle pain in the shoulders, neck, upper back, diaphragm, and the throat muscles. I stopped taking the drug after just 3 days and now 3 more days has gone by and the muscle pains are still as intense. I cannot get relief with any of the pain meds I am currently taking after the bypass. I have sat in the chair crying several times a day - I am in so much pain I cannot take a deep breath. Shallow breathing is not good after this type of surgery. Tomorrow my Dr. will do bloodwork to see if there is any muscle damage. Anyone have this kind of experience and what is the expected time to get back to normal. Thanks,.