Hi Janet & welcome.
You are taking 700mg of neurontin per day.
Most don't feel any relief until between 1800 and 2700 or higher.
I was at 4200mg/day when I switched to 600mg Lyrica/day.
1000--500mcg of B12 on an empty stomach could help with the pain, but it isn't an immediate effect. Pain should gradually decrease over time (6 months or so).
Exercise circulates the blood to the areas that need it, so it couldn't hurt you to exercise, but expect it to hurt after your workout. Exercise increases blood flow and the nerves fire with this increase, and your brain will interpret this as pain. Getting better is as painful as getting worse, for some of us, I'm afraid.
Supplements help- B12, ALA, CoQ10, Folic Acid, Fish oil, and others are a good way to reduce symptoms and pain.
I take 300mg/day of Tramadol (Ultram) along with my Lyrica, to reduce pain.