Not sure if you have spoken to someone regarding this now?? this pain sounds typical of trapped wind…. are you eating nice and slow applying your 20+ rule?? has it worsened since you had your last fill??
Did you try any of the wind preps mentioned, you can even try doing windmills with your arms and making sure you are keeping up and mobile especially after evening meal
If anything is ongoing I would call your provider and request a nurse call so they can assess you xx