S.H.
Instead of calling the advice Nurse, call your OB/GYN.
And tell him/her what is going on.
Do not guess.
Only your OB/GYN can give you a definitive conclusion.
I really doubt, it is a milk/dairy intolerance.
Because, the 'pains' are happening every hour and have a pattern to it.
That is not a milk/dairy intolerance.
Again, DO NOT guess at this. Nor keep guessing.
You need to see your OB/GYN.
Its been 3 days already.
DO NOT self-diagnose.
And being you are pregnant.