Lisinopril and taking time

I had a heart attack a little over 15months ago & am now on several different meds. For the past 10 months I have been coughing& I mean coughing, can hardly breathe. The cough wakes me up at night, I feel as though I am short of oxygen & have to tell myself to be calm, take a slow deep breath .I am starting to resemble a fish that is out of water. I have told my doctor on many occasions but to no avail. I have also put on 15 lbs on weight . I am too afraid to come off the Lisinopril as I don't want another heart attack. I can't afford another med as i am self pay & can't afford another expense.....I am trying to tell myself that i can live like this, but now the coughing is annoying my work collegues...Also having vivid dreams, am out of breath with any exertion, blah, blah, blah...Anybody got any ideas??? Or should I just stop the meds & die??? Sorry, that was a little dramatic, I am just very tired. Thanks for taking time to read this. Good luck to those of you in the same boat.