Pain in hand between fingers, dr thinks overuse injury. also started in other hand and twinges of it in foot. any ideas on what it could be?

See below : These are very vague and nonspecific complaints a thorough history and physical examination would be helpful to clarify your etiology. I would seek based on your complaints if this continues to be a problem some for you , either specialty orthopedic surgeon or neurologist. Your primary care physician could you guide you to one of the above based on his history and examination. Thank you.