What I know about GABA is relatively limited, but I understand low levels of this neurotransmitter can cause intense anxiety among other things.
I did some research and it seems to suggest that the withdrawal symptoms from Benzo abuse are extremely long lasting. One site said it could take three weeks without taking them to completely get them out of your system, but stopping abruptly causes severe side-effects.
Of course you know this, but my question is whether you are absolutely sure the damage is permanent. You mentioned you still did some Benzos, and I'm wondering if what you've experienced might actually be prolonged withdrawal from cutting your dose. Have you been diagnosed as having damaged neurotransmitters?
Anyway, I wish you the best of luck (I struggle with anxiety myself). Below I'll copy paste part of a messageboard post from a doctor who is VERY anti-Klonopin. His post was about the evils of Klonopin abuse, but I think the info might still be relevant:
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"Many patients need to taper off over 2-6 months. Some can never taper off the medication because the GABA receptors of the brain have been altered to such an extent that they have permanent changes in the brain's biochemical nature. The reason for the prolonged taper is simply the extremely long half life.
Many people are suprised that once they quit the drug, they do not have any withdrawl symptoms for several days. If a patient was taking 20mg per day (I have seen this high of a dose with severe addiction), it would take over three weeks for the body to eliminate 93% of the drug. Even at three weeks he/she would have about a milligram's worth of Klonopin in their system.
The withdrawl that I have personally seen are as follows: severe depression, suicide, insomnia, decreased cognitive ability, seizures, tremors, blurry vision, elevated blood pressure and pulse, panic attacks, fevers, restlessness, hallucinations, sexual arousal disorders, delusions, illusions, nausea, vomiting........"