Hi Marty ~ Being a chronic pain patient myself, I've dealt with situations like this myself. If I were you, I'd just ask for increases in the 2 medications that have been working well. Why change when they have worked so well in the past? You've just gotten used to the present dosage - an increase in dose is called for, that's all.
As far as a pain medication - NEVER ask for a specific drug. That will automatically make them say NO. You have to let THEM decide which is best for you. They don't like it when YOU choose - besides, that's sends them a red flag that you might be a "druggie." They should know better by now, but still - that's what they think.

And usually, they would leave the prescribing of pain meds to your GP or your pain doc. Neurologists normally do NOT prescribe pain medications - they don't have time to monitor patients.
Best of luck, and I hope everything works out. Let us know how you come out with your Neuro. God bless. Hugs, Lee