What can I do at home for a tooth/earache that goes down jaw bone between ear and tooth?

Tooth pain. Try warm salt water as well, 1tsp salt w 8oz cup warm water for 1 min.
Not much. Instead, go see a dentist and or doctor to see why you are having these symptoms. Possible infection?
Tooth pain. At home you can take analgesics like advil or tylenol, (acetaminophen) but these are only temporary treatments, you need to see your dentist or physician asap to determine the origin so appropriate tx regiment can put an end to the problem instead of just masking it.