I am not sure but agree with dahlek. You have to ask sometimes for certain things tested in your blood work. I found that out a few times. Do you have a gp or other doc you see reg that could order this even if you call and ask over the phone if you were just there? If you do this then you may want to look at some other possibilites too for blood work.Like I had a doc also do some auto immune issues the b vitamin level so on. Good luck on your choice. I also wonder do you have cramping?This is going to sound stupid but I either had an iron issue or pottasium. This was 10 years ago and 19 so can't remember but anyhow I felt like I got hit by a bus and they gave me meds and it really helped for that issue but a blood work should tell. Good luck I know how the neuro and many doc opinions can get. Its hard to know what to do.