I too had different pains on only the left side of my body for a year or so and after seeing two other doctors for it I was referred to a Neurologist. He ordered mri's of my brain and cervical areas. Found out my spinal cord was being compressed from C2-C7 ! I am seeing a Neurosurgeon later this morning to discuss surgery. My spinal cord was "short circuiting" and causing different pains at different times but only on the one side of my body. I'm not looking forward to surgery but sure do feel better knowing what is going on. Good luck.