Am not sure if on correct group... but just had teleconference with neurologist... have had p.n. since 2016 and last few months strong shaking inside not visibile outside. He said Essential Tremors. Found out yesterday low on Vit.D and he said a bit low on B.12. I am not on meds for p.n. as have so many other issues going on and reactions to meds.... so now will be searching for how to cope with this shaking inside... it doesnt hurt but it sure is horrible and getting longer and stronger each day... am reading your comments, but cant take it all in at once, thanks for sharing.....j.