I have "Restless Leg Syndrome" the feeling is just horrible. Its even more of a pain in the *** when I'm trying to sleep and I'm getting leg spasms and muscle cramps. There's been a few times where I woke up with a Charlie horse from it. Restless leg's all my life, was told they were just "growing pains" when I was just a boy. It makes it really hard to sleep at night, its like when racing thoughts, anxiety, depression are not keeping me up at night, muscle cramps (painful) and spasms are.
I recently injured a leg muscle bike riding, because I found a good remedy to it was to exercise until my legs hurt, as this would let my body produce enough endorphins to cope through the pain. Since I've been injured I haven't been exercising and my muscles are wasting and the spasms & cramps are getting worse. Also when my anxiety gets really high the spasms get worse. I learned to control the anxiety in my head a lot better now and it seems like I'm seeing more physical symptoms now than mental ones.