I am prescribed Gabapentin for Fibromyalgia, and my GP felt it would also help with my severe anxiety disorder. I only take it as needed at 600mg every 8 hours. My anxiety has been completely out of control lately, and I took it earlier today to see if it would help. I noticed a marked improvement anxiety-wise, but feel as though I am in a complete daze. I went for a long walk and noticed that I felt like I was floating, and that my brain was functioning properly when I was interacting with people at the store. I have recently been diagnosed as anemic, so this could be the culprit for the some of my symptoms; including increased anxiety.