I don't have pain when I'm sitting or sleeping at night, but after I start walking, the pain continues to increase in intensity. I have to sit on a bench and rest for 10 minutes, otherwise I can't continue walking. I'm having trouble walking because of the pain, but the pain doesn't go away after I rest.
edit: I take 40 mg of baclofen per day.
If you ask me, it's on account of the spasticity. Your leg muscles, especially your calves are all taught.
The walking is compounding everything.
Even if I sit and rest for half an hour, the pain in my calf does not go away and when I start walking, it starts again.
There is resting, and there is resting. I massage my muscles.
Course, you know your body better than me. I do plenty of TENS stimulation as well..
I go to physical therapy 3 times a week. It generally strengthens my legs and every time I go, TENS is applied, but unfortunately it has no effect on the calf muscle pain.
i have terrible plantar fascia pain from my calves
my pain is at rest actually, but it was more in the achilles and now plantar fascia. just terrible. I stretch a lot and just doesn't go away :/ it's all rooted in the calf tightness. Guess I have to somehow up my stretching and try EMS/TENS on it
Is this progression or regression?
Could this be AMN? Elevated VLCFA and white matter changes with adrenal insufficiency
How old were you when you first noticed symptoms? 
Pain in Cervical Spine?