For about 10 days, I have muscle twitching in my calf, thighs and also in my eyes. I am worried about it. I got my blood test done. It showed that I have a severe vitamin B12 and vitamin D deficiency. My vitamin B12 was around 50 ng/L. Can these deficiencies be the cause for having muscle twitching? Is it something more severe as amyotrophic lateral sclerosis (ALS)? I am suffering from stress. Please help.