Should i be greatly concerned about a tumor diagnosed on a vein in my left cheek causing throbbing and headaches and when rubbed with a q-tip by the dentist a loss of feeling?

Health Concerns: Without knowing the details of your diagnosis, it wouldn't be prudent to comment at all. Discuss all of your concerns with the team that is treating you.

Tumor: Very broad term. Cannot comment without knowing exact diagnosis. This is a question better asked of the practitioners that have examined you and conducted appropriate diagnostic tests.