Be at ease -- It is very unlikely that you are dying -- Even if it is some kind of cancer and you have to have jaw surgery, it's not the end of the world, just the beginning of a new world, as you can see by the number of us who are here and very much alive -- It's not cancer until someone takes a biopsy, by minor surgery or fine needle aspiration (aka FNA) and looks at it under a microscope and SEES cancer -- There are a number of things it might be and cancer is only one of them.

If it is cancer, there are still a number of ways to deal with it; none of them fun, of course, but not life-threatening.

Blood work would be only if ENT or specialist thinks it's needed -- My ENT and surgeon only cared about blood work as a pre-surgical tool, not as a diagnostic tool for cancer -- I don't know anything about cysts.

Sorry your ENT isn't more in tune with keeping you posted on what it might be so you don't have to worry so much -- On Monday, bug the heck out of his office until he calls you back -- It will give you something to do about it all and maybe he will learn to treat his patients with a more caring attitude.