I don’t know much about this really, but I wonder, could it be possible that he is refluxing but there is not enough damage yet to cause pain just irritability? Kind of like when you are on Zantac and it is a little OK but not totally OK?
I am sure you have thought of this, but if you are breastfeeding have you done anything different? I have also heard some babies self wean? Not sure if that is true or not, definately not an expert on breastfeeding!
I get what you mean though, sometimes they are just grumpy because they are- they might have a cold, teeth moving around, be p%^&ssed of at the world (OK maybe not!). I guess you will know soon enough.
Hope you can decipher the code- maybe get Tom Hanks around (OK that wasn’t funny!)