I was having the very same experience as you were. I was having difficulty functioning mentally and very much felt the "FOG".
I decided, after some on-line research, to cut the Lyrica from my daily routine. I have been doing far better. The pain is no greater without the Lyrica and I am not in the "FOG" so much. Dropping Lyrica has been a great decision for me and I am better for having done so.