i get spasms in random spots on my arms all the time, either the top of my forearm, my bicep, and sometimes my shoulder. I get them around my calf muscle 2, its maddddd annoying. But sometimes i wake up in the middle of the night, and my heart is beating EXTREMELY FASTTTTTT, and it scares the shit outta me i have only told a few ppl about that 1. Any ideas of what that could be?