What kind of "shaking"?
I had shaking when I was B12 deficient. I also had a mild tremor in my hands, but the shaking I had was downright embarrassing at times. I'd shake/shiver like it was subzero temperatures... while sitting in 70 degree weather. I didn't have it continuously, but it was not at all uncommon for me to start shivering for no apparent reason.... and I could not stop it. I didn't feel cold... but I shivered like I was.
I list my symptoms here, and I think shaking is on my list. I most definitely had it.
http://jccglutenfree.googlepages.com...ciencysymptoms
It took a long time for my symptoms to resolve. I noticed some improvements within 3 weeks. The majority of my major symptoms were gone within six months... but I continued to show improvement into the one and two year mark.