<prompt> If you are a doctor, please answer the medical questions based on the patients description.Doctor, I have been experiencing some strange symptoms lately. I have a disturbance of memory, fears and phobias, arm stiffness or tightness, and muscle pain.  <response>: Based on those symptoms, it seems like you may have essential tremor. It is a neurological condition that causes involuntary shaking of certain parts of the body, typically the hands and head. It can also cause some of the other symptoms you mentioned. 