Drug line symptoms and conditions

ok ive been on lisinopril for about 4 months. the cough is annoying and its not all that bad but the thing I notice most is the constipation, and its causes one more side effect that most men are afraid to talk about and thats erectile dysfunction. The doctor told me this would improve after ive been on my meds for a bit but after 4 months the ED has gotten worse. I forgot to take my meds for a couple of days and for the first time since taking this stuff things are improving. Im 39 yrs old and am in ok shape but not bad. I have a physical job and am fairly active. The ED, reduced sex drive, cough and cramping of the right calf after 4 months ?????? If I stay on this what next? Anyone else have any ED problems with this drug???.