Hi Jappy,
So sorry to hear your news! I am on another subgroup (CRPS) but I saw this post as I scrolled by. My mother has MS so I understand about surgeries and exacerbation. I will be praying for you too. It's always worth telling anaesthesia and everyone else about the MS in case they can do anything to minimize repercussions. 900 mg neurontin is recommended pre-op to stave off chronic pain and might help keep the nerves more calm in general.
Sending Healing Love,
Littlepaw