What can cause a lump in the throat feeling w/ extra saliva? It's making me nauseous. I try to burp it away, but it doesn't help. Stress? Indigestion?

Too many. There are too many possibilities to list in this limited forum. As a general rule any pain, bleeding or (as in your case) swelling should be investigated. Please call your primary care physician. Referral to an ear/nose/throat specialist may be a viable option. Good luck.