Lisinopril and included headache

My husband took lisinopril for only two days and had to stop. His side effect symptons included headache, muscle and joint aches, fatique, insomnia, fever and chills, loss of appetite, and THE cough. All of these symptons were severe! It has been two days since he stopped taking lisinopril and he is still flat on his back. I am really amazed that this med ever passed FDA approval, and why any doctor would even prescribe it. I wonder if the docs prescribe it because you can get it at Wal-Mart and a local grocery store pharmacy for only $4.00 per month. Makes me think that the manufacture is trying to push this drug inspite of the horrible side effects by dropping the price, which the insurance companies really love.