Causes of tremors

Can a pinched nerve or vitamin B-12 deficiency cause tingling, numbness and body tremors?

My problem started with tingling and numbness in both feet (eventually disappeared) - it then progressed to leg tingling during physical activity (eventually disappeared) - now I am experiencing hand and foot tremors when attempting to hold certain positions, constant internal trembling feeling when cold and occasional jerky muscle`movements. I was told by my doctor (after an EMG that showed S1/L5 radiculopathy) that I likey have a pinched nerve or bulging disc. I tend to believe her simply because NONE of these problems started until I strained my back while grooming my dog a year ago. Also, after seeing a chiropractor for several months, my leg tingling significantly decreased. My doctor has suggested an MRI to confirm her diagnosis. Diabetes and thyroid issues have been ruled out and I'm sure othe CNS disorders will checked for as well. I just wanted to know if my tremors could possibly have other causes besides Parkinson's or MS (which is quite scary and is all one sees on the internet as a cause).