New Reflux Mom – help!

Hi out there!

I took my son to his ped yesterday knowing something was not right. She thinks he has reflux…or possible a milk protein allergy. We are trying out baby zantac first to see if it helps. She also told me to sleep him on his tummy for naps, and on his side at night. He slept soooo much better last night, and he took 2, 2 hour naps yesterday…this is unheard of in my house! My only concern is that this morning he actually seemed fussier after eating. I don’t know if I am imagining it or not..did anyone else experience this after starting meds? Thanks for your help!