Vivid Nightmares, I wake crying and shaking I haven't slept a nig...

Vivid Nightmares, I wake crying and shaking I haven't slept a nights sleep since I started taking it. Loss of appetite, weight loss of course, nerves are shot and of course I am agitated all the time. My nightmares are all bad and gruesome. I am a very serene and content person and this is affecting me in a very hurting and unhealthy way for me I also just came home from the hospital from having astete put in my left artery of my heart and these nightmares are lacking my needed sleep. Is there any other Meds for Alzheimer's?