I also have a similar problem. I have a very stressful life at times. It's been almost three months now, I feel shaky inside in my shoulders or arms or hands or all three every day, well now it's almost every day, but I do get some days off and so I feel like maybe it's slowly getting better.
I have come to learn or become a bit of a paranoid individual, not too bad. I often have a hard time relaxing, my wife is always wanting me to switch on a super husband mode of cleaning and doing stuff and when I try to do something I enjoy she just gets mad, "I should be cleaning or something".
I get especially worried when it comes to health matters. This started about 5 years ago when I was diagnosed with an autoimmune disorder in my inner ear. This has not really resulted in any problems and despite the original prognosis that I am going to go deaf I have had no noticeable hearing loss. Then I got a really bad strep infection that kept coming back, this was two years ago. This caused joint pain, and numbness and tingling. I finally got my tonsils removed in December and now most of those symptoms have gone away. During the time I was so worried I might have another auto immune issue such as RA or Lupus or MS or something. I still worry about MS, but I have had two MRIs, both were pretty normal and am having no other MS symptoms, except occasional twitching (when I am anxious) and tingling.
My doctor assures me that my latest internal shaky feeling is most likely anxiety. I have been on Lexapro 10 MG per day and that has not helped with the shaky feeling but it has reduced my heightened illness concerns. I think she wants me to try 20MG per day but I don't like how it makes you feel sometimes like not wanting to engage in daily activities, especially important with a demanding wife like mine. I do think overall the benefits of Lexapro greatly outweigh the side effects though.
Anyway, most days when I get the feeling I try to ignore it, I am just grateful that my other symptoms have mostly gone away. The symptoms seem to last from a few minutes to a few hours. Nothing in particular seems to help, but does sometimes seem worse when I am anxious. Although this is not always consistent, sometimes I can have no anxiety and the symptoms and sometimes a ton of anxiety and no symptoms - so confusing.
Anyway, I wish each of you well.