Weird combination symptoms and conditions

This was my husband's experience, not mine. He started Lisinopril in October of 2007. After one month he started having anxiety/panic attacks, started having trouble concentrating on reading (which he loved), his memory was shot, he didn't sleep well, he lost his sense of humor. After two months, in one week's time, he spiraled into such a deep depression that he ended up taking his own life. I'm convinced it was because of the combination of Lisinopril, diuretic and Statin he was taking. He was a different person after adding Lisinopril and Simvastatin to his diuretic medication.