I had hallucinations when they put me on a blood thinner that reacted with one of my psych drugs. They weren't sure which on so they took me off all of the psych drugs as I had to keep taking the blood thinner for a serious blood clot.

At the time it was just confusing but when I realized I was hearing and seeing people that weren't there, I really got scared. Fortunately, it only took a short time for me to go back to normal but it was a long five days.