Thanks for posting your query.
I had gone through your concern.
Since the pain associated with left side of head,teeth as well as ears,get a thorough evaluation of teeth on your left side.
Usually impacted wisdom tooth
,which fails to erupt as usual will lead to such condition.
As per prescription,amoxycillin
as well as analgesics has to be administered.
Gargle frequently with lukewarm saline.
Get the tooth either extracted or retained depending on space available for tooth eruption
Hope this helps.