I haven't been on gabaapentin but was on both Depakote and Lamictal, and went off them with no difficulties whatsoever almost 10 years ago. Just the same, this book should tell you how to taper off your meds safely, and what supplements to take to prevent you going into withdrawals. This same author has a couple of other books that you might look into including one on healing with amino acids that tell you what amino acids and other supplements help alcoholics.

Break Your Prescribed Addiction by Bille Sahley, PhD-painstress

Your meds could be causing the increase in anxiety.

https://www.peoplespharmacy.com/2012...-side-effects/