Apparently, yes, B12 deficiency. I believe it was caught way to late.

Hi Rachel, i want to wish you a lovely trip next week and hope the magnesium will help. I often get leg cramps and creepy crawly feeling in my legs at night despite taking magnesium pills. I use a magnesium cream which works well and have also used the Hylands leg cramp pills which sometimes work on the jittery feelings. With regard to genetics, I thought I remember your mentioning your Mother having a chronic pain problem in the past which might shed some light on your current issues? It seems to me to be very unusual for just a vit. B deficiency to have gone undetected for so long as to cause such extreme health issues, I would not have been happy with my family care physician for having missed this. Helen