Hello Good Evening,
You have history of physically and mentally stress
, so pain can be of gastric or muscular origin but cardiac origin should always be excluded.
As you mentioned that pain subsided on a particular position and come back on another, then there are little chances of cardiac origin, and it can be of viral myalgia
or gastric/duodenal ulcers.
So you should go through proper evaluation with proper clinical examination and following investigations:
Further management will depend on final diagnosis.
Dr. Naresh Jain.