Hi welcme to Health care magic forum. So far my knoledge is concernd there is no possibility like this.
The weight gain could be due to over care post operatively and pain of back and arms may be due to previous
gastric pain not treated completely or may be due to sutures given intra abdominally.
I advise you to consult the surgeon who have operated. You may hdve to get MRI
done besides other
routine tests for confermation.
Besides i advise you to follow some diet recomendations as avoid fatty foods oil sweets potato and
other tubers flushy fruits and juices to improve resistance. Wishing for a quick recovery and thanks for