It does take some time to get a diagnosis of MS as well as other conditions. I would ask for an MRI with and without contrast. Additionally, I would ask for an MRI of the cervical spine as well as throacic spine. While lesions are sometimes difficult to detect in that area, if you are in a flare they more than likely will show up.

A journal of symptoms is a good idea and will certainly help in the diagnosing process.

The tingling in your feet sounds like some sort of neuropathy. Be sure to discuss that with the neuro when you see him in March.