According to the description it seems what you are experiencing is most likely a flickering of abdominal muscle and should resolve on it's own when the muscle is given adequate rest.Though the exact diagnosis can only be made after examination by a Physician,if it isnt painful and stops on it's own in few hours to a maximum of two days then it is more likely due to muscle twitches.Other than that it can be due to electrolyte or endocrine deficiency.
If it persists or you develop any pain or swelling or any new symptom then please seek prompt medical consultation.Avoid any protein shakes or any new food item which can cause such issue.In case the symptoms persist consider visiting a Physician for clinical assessment.
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