I find waiting for things physically exhausting. Waiting in lines, waiting sitting in a room, waiting on friends to decide what they want to eat, walking really slowly with an elderly relative: I find it all physically exhausting even though very little physical energy is required.
Also diagnosed, also experiencing the same. Was always chronically late for everything growing up because my aversion for waiting made me want to leave as little margins as possible, but my poor grasp of time led to me always misjudging.