Hiya. I know what you mean about internal shaking.
I get it when my nervous system gets overwhelmed. I think it means we are constantly living on the edge because we are not living the life that our belief system expects us to live. So we are constantly on alert and stressed and become used to being like that so we think we are normal.
Address adrenal fatigue, give yourself daily and monthly and yearly. Also periods of rest, meditation, silence daily plus do the things you love and delete the things you don’t like. Eat healthily and exercise is important - gentle exercise, nothing sweaty and stressful. I mean we may as well live our lives out as we wish, other wise why be here in this body, on Earth..? Take charge. I may be right, it’s worth a go. It worked for me. Best wishes.