Thanks for response Garym. I try to relax about it 
Its not realy a shaking, it is more like this: if i bend down, maybe to stretch my backmuscle, i go down in some "steps", as if my backmuscles will "go on and out...on and out" and not in one single motion.
Nobody know this?
Sorry all if i sounds like a cazy man.
Regards
Florian

Its not realy a shaking, it is more like this: if i bend down, maybe to stretch my backmuscle, i go down in some "steps", as if my backmuscles will "go on and out...on and out" and not in one single motion.
Nobody know this?
Sorry all if i sounds like a cazy man.
Regards
Florian