Brenda,
I may be incorrect here, but I assume your jaw tumour is on your lower right. If it has settled, but is still putting preesure on the nerve you could experience a whole variety of symptoms including, "the men with knives!"
If this is the case and I were in your position I would go talk to the doctors and let them know what is going on. Many doctors don't like to sever nerves and cause permanent numbness, but in your case it may be warranted.
E-mial me if I can help you with this.

Mike