If I had to take a guess, I would say that the calf spasm is probably related to the PN.

It is not unusual if someone has a bad calf spasm for the calf to be very sore for days afterwards. I have had the same thing. Th calf spasm might also be related to your spine issues as well.

Stress is hard on the body, and can do alot of nasty things it is true, but in the setting of PN & spine issues, I would think it would be one of those first.