I am not a doctor. It sounds like your doctors have ruled out a brain tumor, but you still have one symptoms. It could be a nerve issue. There are tics and other issues, but I have to tell you that while there are medications for this, the side effects are probably worse than your symptoms.
I would bring up at your next physical.
also
i dont have any numb feeling
my reflexes is ok
my memory is ok
im working and have a job
i drive my car without any proplem
etc