Good grief! Phenobarbital?
Talk about jumping from the frying pan into the fire.
I apologize, but no, please, please...
The fact that it is sedating might be attractive to you, but it will likely impair your ability to drive (and think) a good bit more than the Klonopin. For the rest, it is just as "addictive" and has more interactions.
Seriously. I encourage you to simply ask the doctor for his support reducing the Klonopin as slowly as you need to, without adding other medicines.
Down by 0.25 mg every ten days should be ok. You could even try every week if you feel comfortable, but I'd just plan on seeing how it goes. I would not go any faster than one reduction per week (7 days).
You managed a lot of stress, despite your condition, with what you went through with your father. Kudos to you, and I am glad your dad did not have a heart attack. Is he alright?
waves