I wonder if what you're experiencing now is really sedation, or simply the absence of withdrawal effects. The choice is yours, of course, but I still think it would be worth pushing through, and the withdrawal effects such as irritability should lessen over time. You're still in the middle of tapering off, and your body hasn't had that much time yet to adjust. I understand that this is very hard after you've been taking benzos for 26 years. After so long, it's really no wonder that withdrawal takes a long time and the benzos won't let you go without a fight.

I agree with WindsThatBlow that, while we can maybe offer a bit of support, a benzo addiction this severe requires more help than that. I think it would be a good idea to let your psychiatrist or other primary care provider know that you're struggling. Benzo addiction is one of the hardest addictions to beat.