Welcome to ThisIsMS, JMan. As you asked, here are my thoughts: I commend you for the prompt action you have taken with your situation. I understand your concern about MS – it could be the reason for your symptoms OR it might not be the reason.
Your family practice doctor is to be commended also for his quick action and testing for possible causes.
I am the "insulin girl" here at this website – I think the MS cascade starts with excess insulin. In my case, I think the "raw" or "sunburned" feeling I have in my feet and legs is due to damage in the capillaries and other blood vessels caused by the caustic hormone insulin excess (blood tests have shown repeatedly that my insulin levels are elevated – I'm always above the optimal 3 UU/ML or below level). From childhood, my diet has been heavy on carbohydrates which I believe pushed my pancreas into chronically secreting too much insulin. I suspect that your "episodes" have been times that your pancreas has been "on the fritz" – producing too much insulin, perhaps in response to a diet temporarily high in carbs and sugar or perhaps because of a virus/bacterium or for another reason.
I encourage you to ask your family doctor for a "fasting blood insulin test." Here is my reason: I assume your glucose test was done on fasting blood; the 99 is on the high end under those conditions. You are not yet in the type II diabetes range, but in the progress toward type II diabetes hyperinsulinemia (or excess insulin production) comes before the high glucose level which defines diabetes. Your observation of the burning sensation in your feet "especially in the morning when [you] first get out of bed" does not precisely fit my insulin idea because insulin production usually decreases overnight when we sleep… UNLESS your pancreas is not operating properly.
Concerning the TSH test (thyroid problems are good to rule out because they can manifest in "MS symptoms")… but the pituitary gland-produced TSH test does not give the whole picture of the thyroid. Your thyroid may be just fine, but a more complete picture would include testing for Free T4, Free T3, Total T3, Reverse T3, and anti-thyroid antibodies.
All the best to you on Thursday with the neurologist. I tend to believe these specialists can only see a problem to be within their area of expertise.
My hypothesis: excess insulin (hyperinsulinemia) plays a major role in MS, as developed in my initial post: http://www.thisisms.com/forum/general-discussion-f1/topic1878.html "Insulin – Could This Be the Key?"