The pain is not something I need paid meds for. It only comes and goes and last for a second or two. If I twist a certan way or reach for something I feel a slight burning sensation over my ribs in one spot on my mid to upper back, left side. I remember hearing that left side back pain is a sign of pancreatic cancer so that worries me a little too, but this pain really feels superficial, not deep in an organ or bone. It's hard to describe, it's like a stitch. It's brought on by certain movements, the chiropractor thinks it may be muscle or nerve irritation in the intercostal ribs, he said the muscle between the ribs. At first I though it was the begining of shingles but I never got the rash. Pleurisy is something I worried about too, but no pain when breathing or coughing,
I know we've been over this subject before -- a couple of months ago. Here, let me save you the trouble of looking into Dr. Google. You will get thousands of posts with people with left and right sided pain. They will get thousands of tests (sometimes to a person) and they will find nothing conclusive. I happen to know this, because I visited every website about side pain.
It is anxiety. Your body is folding into a "fight or flight" reflex. Read about this in "Somatics", by Thomas Hanna.
The thing to do is not obsess about it. Here is why. You worry because this is where many organs are located. Also, because some people equate it to a herniated disc problem, which is almost certainly not the cause. If you fret and worry and obsess about it you will end up twisting your torso into the most painful wreck of a thing you can imagine. Then, when you go looking for help, everybody will shrug their shoulders.
Look up some of my old posts. My pain was right-sided, but it makes no difference. The only two things that can rid you of this and the other things you obsess about is to understand what anxiety does to every body's muscles and nerves, and to learn how to skillfully relax or meditate.
No offense on chiropractors, and yours is probably right about the physical cause of the pain but probably does not know -- or would admit-- to the cause of the problem, emotions in the unconscious.. The one chiro I went to about the problem said that I would never be 100% again, and to live with the pain. I only went to a chiro because a friend said to go. I didn't know he was a chrio. Personally, I think most of them contribute to ongoing pain and anxiety. Most will cause your wallet pain.