What non invasive tests might diagnose my problem?

I have discomfort center left immediately below my breast. It is very close to the center. It’s like a knot. Like something in the way. The pain (very mild pain) does not radiate. I don’t have pain through to my back.

I guess that is near the bottom of my esophagus, or stomach, pancreas maybe? Possibly, intestine, but maybe it is too high. I have been constipated, but I often am for the last 20 years, this is different.

I went to the doctor and she chalked it up to being constipated. This is different though.

I realize they could to an upper scope, but I really dread that. Can I get an ultrasound or MRI?

Of course I will go to another doctor, no one has to tell me get a second opinion.

I might try to track what I eat, when I eat, when I feel it. I don’t see any difference with spicy food or mild food.

It is not heartburn. For a year I have had on and off mild nausea, which is extremely odd for me.