I am supposed to be on this drug Lisinopril, but I had to quit because of the side effects. I started coughing and have drainage since June. I went to the doctor three times before I went to another one and she thought the drug was the culprit. Right now, I still cough some, but the draining is still with me. I have sinus problems, so I was being treated for that. Do I have to have these pills?