Your symptoms are not likely due to abdominal viscera (due to absence of tenderness, nausea, vomiting) ; and abdominal wall can be responsible for this pain. ACNES (abdominal cutaneous nerve entrapment syndrome) can be a possibility and the diagnosis can be confirmed by the subcutaneous infiltration of the local anesthetic like xylocaine. If the pain disappears completely, this substantiates the diagnosis. Abdominal wall pain can occur from nerve entrapment syndrome, irritation of intercostal nerve roots, anterior cutaneous nerve entrapment, rib-tip syndrome, myofascial pain and trigger points.
Please feel free for your follow up questions.
I would be happy to assist you further, if you need any more information.