If you think that you may have a stomach anchor and your doctor is not worried about your health, then it is the time to change your doctor and go for the second opinion. I hope you'll be able to find your answer then.
But still, I'll suggest you to not overthink and panic yourself. Sometimes things are not that worse but we made them serious by overthinking. So stay calm & be positive. Make an appointment with another doctor asap and get tested immediately.