The front tooth filling, if the primary contributor (unlikely) would be sore when you touched or tapped it gently.
More than likely (99% probability), the lower jaw is the contributor. Either past Dental work already done, extraction, etc., which hasn't fully healed, or possibly something new which hadn't yet shown up on your Dentist's x-rays taken recently.
Again, and I'm sorry I can't say with more specificity, but I'd consider getting a second opinion.
I certainly do hope this pain subsides. Has your past Dentist prescribed a pain med for you?
When the pain you are having, radiating to the whole side and up towards the temple and jaw occurs, it almost ALWAYS due to a lower jaw situation.
I'm going to be gone for a couple hours. I'll check back, should you have any further concerns, etc., OK?