Hi. Thanks for your query. You have a classical history if I re-read it. You have a stabbing pain- upper abdomen- increased by laughing - nausea - side hurts and from the underside of ribcage from left side. The probable diagnosis is : -Costo-chonritis of the left side of the lower chest- can give referred pain -MRI of the spine as the slipped disc at the thoracic level can cause the same. -Fractured rib causing neuralgia- - rare will be local cause like stomach ulcer or cancer. Local physical examination by a Doctor can get the proper diagnosis and may need the investigations as per the findings of the clinical examination.