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That would be a part of the intestine which is most likely causing the problem,
If the pain is mild, then it may just be a mild infection/ inflammation or even the food disagreeing with you,
However any severe pain needs to be evaluated,
Another issue could be gastritis, since a part of the stomach is at the same place too
A 6-7 pain if persistent certainly requires a medical consultation
Are there any associated symptoms ?
This could certainly be related to a worsening reflux
I would recommend that you get the same evaluated and take specific treatment for the same,
In that case, you need to tell him about this symptom,
In the meantime, try to take some oral antacid if possible
and go to the ER if the symptoms are severe,
Cannot be sure without physically examining you
BUt a severe pain may require medical evaluation
If the pain is not worsening, then sure
you can wait