I saw a psychiatrist who diagnosed me with my generalized anxiety disorder/panic disorder and explained my symptoms were from anxiety/stress and lack of sleep. He also prescribed me Zoloft, which I never took because I'm too scared of possible side effects even though I was having 3 panic attacks a day that were so bad that I experienced depersonalization. I get why the shaking scares you, because it terrified me (especially being a hypochondriac) that my whole body would feel like it's shaking from the core while I'm lying in bed.
I think I mostly corrected my behavior by myself - I removed myself from the situation that was causing me so much stress and started to volunteer to keep myself busy. Volunteering with kids makes me so tired that it made my sleeping schedule go back to normal. Whenever I caught myself thinking about the shaking, I'd switch my train of thought and distract myself. Eventually, I got to the point where I only suffer from minimal anxiety in the morning and the internal tremors subsided.