Thanks for your elucidate history of pains at a position you explained and increases on laughing and coughing.
Most likely reason looks to a condition called costochondritis.
Please take a course of anti-inflammatory like Ibuprofen for you weight at 8 hourly interval after food and you may be fine.
Definitely getting checked by a Doctor is always a good habit so that nothing is missed, diagnosed and treated in time so that the no problems in future.
Hope this helps you.
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