Hi, Lailavia, and welcome to NeuroTalk!
In my case, there was no one defining moment/symptom. At 19, I was struck down with a dramatic case of vertigo and hospitalized for 6 weeks. At the end of 6 months, I had resumed the active life of a kid that age.
12 years later, I woke one morning with a numbness/tingling in my pinky's very tip. Within 7 months of that day, I could not feed myself or brush my own teeth. That one lasted 22 months.
I went 6 more years with no problems and it started again with ON and unbelievable fatigue.
I'm almost 45 now, can barely walk 20 steps and depend on a fleet of appliances to accomplish the simplest of tasks.
But, I did just make a whirlwind tour of the west!
Get the spinal tap, a second, third, even fourth opinion, and hope like crazy that it's something else that can be fixed!