Office environment symptoms and conditions

I'm writing for my mother. She was on 20mg of Lisinopril and her doctor insisted her violent coughs was from her asthma. Being an asthma sufferer her whole life and knowing the difference, she insisted it was not. He told her that this drug does not cause violent coughing as she described (but later admitted otherwise). I saw her in October and then in November for Thanksgiving and it looked as though she aged ten years! She was coughing badly, throwing up from coughing so violently and was white as a ghost and was extremely tired from not getting enough rest (from coughing). Everyone in the family told her to STOP taking the medication. She stopped taking it the day after Thanksgiving. It's been about five days and she is still coughing, although it's not nearly so bad, but she's taking pain medication (Hydrocodone) and I believe this narcotic has helped to subside the coughing, plus allow her to sleep, but masked the effects of the Lisinopril. Please, anyone, that has discontinued this medication, can you tell me how long to expect this drug to be out of her body? This has been an absolute nightmare and I'm so worried about her! Please email at ******