Hi David,
Good to hear that the pregabalin is having some effect on the anxiety. I hope the increase in dose helps. The maximum is 600 mg per day in Australia.
Sorry to hear about the insomnia. You may want to consider switching your AD (although I know you have had trouble with that in the past). I am taking mirtazapine 45 mg per day. Like all ADs, it gets mixed reports, but many people say that it helps them to sleep.
Hang in there.
Hanshan