Primary OT (Orthostatic tremor) is a rare movement disorder where rapid tremors occur in the legs when standing and this disorder occurs on its own and is not associated with any condition or disease, where as secondary OT is associated with some cause (like Coeliac disease).
But to qualify it as a coeliac disease you need to be suffering from glutein sensitivity.About which you have not at all mentioned as this condition is detected in childhood.
So i think you are suffering from Primary orthostatic Tremor.
i hope you got my point?
if still you have doubts, please feel free to contact me,