Actually, your symptoms are not that unusual. When I yawn, my hands kind of get stiff for a moment. Also, when I am in excessively stressful situation (vomiting, giving birth, panicky) my pointing fingers wouldn't bend, they just stick out pointing at whatever's ahead
And yet you can have billion symptoms which noone else's had, as well as million variations of symptoms that other people have had. Beautiful disease full of possibilities!