Keep your hopes up. A couple years ago I was diagnosed with severe spinal stenosis. The way it manifested itself was I would randomly experience feeling like I had been tazed. I'd be walking across the room and...zap. I'd be dropped to my knees. No way I could ride.
Fortunately for me a talented neurosurgeon made me as good as new (I keep telling myself). He made no promises but I feel great.
I hope it works out for you as well.