Gabapentin
"My Doctor just prescribed this to me today, 300 mg once a day for 2 days, and then 2 a day for 2 days, and then 3 a day thereafter. 
He said it would make me really tired, as I am also on methadone. But I took the one before I was gonna go to bed, and I cannot sleep at all. I am so anxious and on edge right now.. This medication is definitely not for me...I took it a couple hours ago and I'm thinking about making myself puke because its time release so maybe  it's not all in me yet? That is how bad this anxiety is. 
And since I'm on methadone, I no longer am prescribed Valium. So this really sucks as I don't have anything to take this edge off."