Childhood disease symptoms and conditions

I was just prescribed lisinopril a few weeks ago, for HBP, my pressure was always low but, I recently had a malfunctioned defibrillator change and my BP went very high, so the MD put me on lisinopril. I have been on it for about a month now, but the only symptoms I have been getting is severe fatigue,sleeping a lot and very thirsty. Are some of the symptoms putting on weight, I don't want that, and I did or have not had a bad cough. But sleeping is bad and very tired all the time. Should I ask my MD to change my meds? I did have 2 heart attacks and two by pass surgeries, l4 years ago one in 93 and one in 99. Then my heart weakened and I came down with arrhythmias after passing out. They inserted a pacemaker/def. thanks to medtronic after the pacemaker and def. were recalled I had to get another one, but if this drug is causing everyone a lot of problems I don't want to take it. I do get up a lot during the night (constantly going to the bathroom) due to thirst and am constantly tired I am 51,and came down with this disease (it is a childhood disease and have had it since I was l9), but it is a scary one, heart problems. They never ran in my family. Any suggestions would be appreciated. I am going to get my blood taken on Tuesday to see if this Lisipril is working or not. Thanks for anyone help, I really need it on this new drug. Thank you.

Julie