Is there a cancer or tumor that does not show up on chest / stomach catscan - colonoscopy - endoscopy - X-rays - blood tests CBC panel - heart tests? I've ruled those out and I feel like a engine that's running out of oil. Lump feel in throat / ches

All tests have limit. You must remember the predictions for this past election. If you only rely upon tests for something you are always letting yourself in for a letdown. You should read the new book by Michael Lewis "The Undoing Project", about 2 brilliant Israeli psychologists who investigated how we make decisions with uncertain information. Excellent and important book!