Like Paul said, nerves can definitely make you nauseated. I'm the walking poster child for THAT, alas. (That was long before my cancer, and has been a bane of my existence ever since. I have a severe panic disorder.)

On the reassuring side of anecdotes, I had a 'sore that wouldn't heal' for months, and doctors that tried multiple treatments, before the ENT finally said, "Some things just don't heal till you cut them out and let them start fresh." That's when we found out it was cancer ... but he did have the foresight to be cutting it and testing it at the same time, and going for clear margins. (This was done in hospital, under sedation, thankfully.) So I woke up to find out it was cancer, instead of going through any biopsies or whatever ... had no clue till that moment. And it was still a Stage 1 thing. You really just never know which way things are going to go. Hold on to the positive, till you hear it's otherwise. It helps.