Dear forum, I have had CFS/ME for over 20 years. Recently, after being on a probiotic called "Ultra Flora Balance" for 3 years, and not taking any other medications, I have developed rather serious tremors and a complicated movement disorder that has steadily progressed and gotten worse. I am trying to find out if theoretically it is possible for probiotics to cause this type of damage to the CNS (Central Nervous System) and to cause an involuntary movement disorder? My neurologist assures me it is impossible, but taking probiotics does make me very drowsy and seems to cause tingling in my muscles, and although it does have a very beneficial effect on my pain symptoms, I'm beginning to suspect it MIGHT be possible. What do you think?