So basically i am a really anxious person, i mainly suffer with health anxiety but have social and GAD too.  I have felt the same since my early 20s with the symptoms i get and i am currently 30 now. My legs can get really achy and weak. Also they tremble allot same with my hands at times not sure if it’s my muscles in my legs being fatigued or my anxiety. Sometimes when i don’t think i am stressed out just doing normal stuff i will feel the tremble. It’s not as obvious on the outside that i am trembling but mainly from the inside just depends how bad i am feeling it. The problem i have is my Nan has Parkinson’s, Her brother does and their Dad did too, what i know off. I believe they did got it in later life though 50 onwards. My mum currently doesn’t have it yet but i keep telling myself i do and it’s scaring me.