My mother took lisinopril and she developed the persistent cough ...

My mother took lisinopril and she developed the persistent cough many experience. It was so severe that she went to the ER. While she was there, they told her she had fluid retention in both lungs and didn't link this drug to the fluid retention. Instead, they told her to get a biopsy for the possibility of lung cancer. More money in their pockets for tests and biopsies? Definitely! I definitely see the link between the drug and the cough and the fluids in her lungs. Now,she's not on that medication but she is still dealing with side effects and I feel that all these medications they tell her to take are just making her worse. Has anyone just stopped all the conventional medications of high blood pressure and perused alternative treatments with success? I'm hopeful to find out what options i have that can cure her situation instead of leaving her at the same hopeless stage of dealing with terrible side effects.