For the life of me, I cannot understand why docs Rx Lyrica and Gabapentin.
They both do the same thing, only Lyrica does it better.
I'd try to go with just Lyrica 3x day at 450 or 600mg per dose and Ultram/Tramadol at 100mg 4x day for starters.
See if you can get off the gabapentin with a titration schedule.
Shouldn't take over a week to 10 days to do it.

That's the combination that works for me.

The B12, if in Methyl cobalamin sub-lingual form can be increased to 5,000 - 10,000 mcg per day with no ill effects, but B12 is for the long haul trying to repair nerves. It'll give some energy up-front, but helping with pain is down the road-usually.

The Baclofen is usually used for tremors in spinal cord injury patients,
why do you need to take it?