Your doctor will probably have to do a spinal tap and check out the spinal fluid. Dr. Swank has success with treating MS through diet. You might want to check out his web site which supports his diet. Paleo diet has also shown success with treating neurological diseases. You can google the information if you are interested.
There are a few auto-immune diseases which can show up as lesions in the brain.
Some being MS. Lupus. Bechets, APS. Sjorgens, Sarcoidosis, etc.
Your neurologist should run a full auto-immune blood panel. Along with a Lumbar Puncture, to check for MS, you need to have the spinal fluid for the O-bands.
Migraines and stroke symtoms, can also accompany Lupus, and APS, as they also give jointpain and muscle pain also.
Your neurologist, should offer you an LP to check for a definate diagnosis, as all these auto-immune disorders, have symptoms which overlap one another.