I have to take 25 mg of Ambien and 6 mg of Ativan just to get to ...

I have to take 25 mg of Ambien and 6 mg of Ativan just to get to sleep for the last 9 months. My only side effect so far is eating a lot right before I go to bed as this drug makes me hungry. And I fainted three seperate times when i drank alcohol before taking my pills (I fainted on my way to get food in the middle of the night) I sleep fine for 8 hours, but am worried about any long term effects this amount of ambien will have on my brain. I've heard chronic derealization is a side effect. What is that? What other negative side effects are there? Are there any better sleep aid medications? I have taken Lunesta and have to take a lot of that too and have the same experience in terms of being hungry. Basically they're the same to me so far.