I have COPD and 2 1/2 months ago I had the upper right lobe of my lung removed because of a cancerous tumor. I also have high blood pressure. The only medications I take is Percoset 5/35 once daily, dou new for nebulizer 3times daily and now I just started taking 10 mg of lisinopril in place of taking5 mg Norvasc I was taking for many years, and 2 liters oxygen 24/7, since surgery. Since taking the lisinopril the past week my ankles and feet swell, my breathing is difficult and I am extremely tired. Should I go back to Norasc is my question. I am trying to build up myself before starting chem therapy in a week...