When Lyme and Bart combine, it's quite common for the person to experience more neuro symptoms and for some they become quite severe.
We also know that Lyme loves old injury sites. Many people have old injuries that had quit hurting some time ago, suddenly start causing issues again.
I use to always grimace when I would do something like hitting myself with a seat belt - not because it would cause that much pain in the moment, but thinking forward to what it could set off was the more unpleasant thought.