Hi invisible,
My first symptoms the doctors could see was tremors. I had them for three years before they figured out what caused them.
As more time went by and more symptoms came about, like numbness to the knees with pain from the knee to the thigh.. which was spasticity. I got in the hospital and tested for a week. No MRI's back then.
Actually they think I had it since I was 16, but whose counting? I was the clumsiest kid on the block.

My mobility gets very bad when I relapse. Then I am mobile again after steroids. I hope they find some answers for you.
Peg, I feel for you. I have the burning in hot oil in my feet and legs and sometimes it spreads to my hands and arms. Nothing helps I am sorry to say. At least I haven't found a solution. I have had this 24/7 since 2005 and a dx of MS for over 30 years.
Only five years of burning but I have had the wet pant leg feeling, the itchies, shocks anywhere, bug bite feelings, the numbness and tingling sensations, and tons more that, that come and go.
Fatigue is my crummy one. Bad sleep is my cause I believe. Good luck to you.
After 10 or 15 years some symptoms have gone. My MS dr said they must have burned themselves out. (no pun intended)