My fitbit is giving me an extremely high heart rate reading. i would like this assessed by a doctor to be sure i am fine?

Fitbit error?: I would recommend counting your own pulse to see if it is not making an error which is common. Feel it a the base of the thumb at the bend in your wrist crease and see what you get. Time it with a second hand and count for 1 min. Or have a friend do it and wear it to see if it works on them. Try wearing on other arm to see if you get the same.