I can completely relate. I used to be like this too. I even convinced myself once that a new mole on my head might be a melanoma and I was so upset (turned out to be a very normal mole and afterwards I thought to myself, next time I will breathe and see a professional before I jump to conclusions which I usually tend to do).
This bump, has it been growing? Could it be an ulcer?
I think it's really good that you have seen two different doctors. I know that it can be scary with all the news articles and information on google. I think the thing that gives me comfort is that these doctors have gone through extensive medical training and the more time they have spent working, the more experienced they become. Plus you have seen two different individuals who are able to provide two different opinions so theoretically this reduces the percentage of uncertainty.
I'm definitely here for you though, I know this feeling of anxiety and fear over health. It can take over our whole thoughts and life.