Hi there ~
I understand your concern. Having painful cancer sores inside the mouth can be very unnerving. Also sore jaw bones, sore throat
and headache are also due to the cancerous lesion. I also think that you might be able to get rid of this if you visit with a stomatologist or an ENT doctor. I hope you do so as soon as you can.
I hope this helps. Take care and have a lovely day!