Zanaflex and dilaudid

I am 43 yrs. old and have had 2 back surgeries and other procedures to help elevate my pain, but to no avail. I am now on 60 mg of oxycontin and dilaudid for pain which seem to be finally making a difference. And for some reason my doctor has put me on zanaflex also. I took one dose and I don't know if I wasn't to continue, last night was the first dose and I had a strange feeling as I was falling sleep that I was going to die!!! As I tried to wake myself up out of the drowsiness it subsided and I fell asleep. When I woke up I remembered having strange dreams about my mother and my brother both who has passed away in the past 2 1/2 years. I mean really bizarre dreams that make no sense. I believe it to be because of the zanaflex. Does anyone else have these problems??