Tom,
Your story went straight to my heart. At 46 I was Diagnosed with Primary Progressive Multiple Sclerosis (PPMS). I am now 54, in a chair the last year and half. Sometimes it is overwhelming, I remember how it used to be and realize now that's changed. But I know I can't leave, I still have stuff to do for/with my husband and kids. Yes it sucks but it is what it is. Don't try to predict your future (chair, etc,), no one can, not even the best neurologist. One day at a time.