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It is not stress.
It is possibly a muscular or spinal disc problem .
It must have an exam.
With the high blood pressure, it can be heart pain radiating to the back.
That is not likely but serious.
Other organ pain can radiate to the back.
See your doctor.
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Thanks for this question
This is not a cardiac issue because the pain wouldn't get better with ibuprofen
This is a musculoskeletal problem
I would recommend you see a physio or chiropractor.
They can help you work through it