A diagnosis of MS solely based upon an MRI would not be a good diagnosis. The diagnosis should be made by eliminating possible diseases sing the Revised McDonald Criteria. The test for Lyme Disease should have been part of the elimination process and Lyme should be eliminated long before MS is diagnosed.
Your symptoms can be from a multitude number of causes all of which can mimic MS symptoms and would include Lyme.
Are you on a military base or are you in a private enterprise in Japan? I lived and worked there for many years.