Thanks to all for the info. The suggestion to check blood flow is very helpful; my dad had arteriosclerosis and had stents put in legs so perhaps I have two problems! My b12 is high and I am hopeful that some nerves will heal, or at least the b12 will stop progression.

I will start exercising - we have a gym in my building and pedaling a bike sounds great! I can sit which is the only time I feel secure. I have been quite sedentary and pretty depressed, so it's time to get up and go!

Thank you again for your help ! And best wishes ... sending good thoughts and encouragement your way.