weaning off zantac at 16 months

We’ve been to a GI specialist and she wanted us to do the following:

1 week- skipping am dose and giving maalox instead

2nd week- skipping am dose and no maalox

3rd week- giving pm dose every other night

So far so good, i think. I don’t hear any of the wet burps like i used to. His naps during the day are fine. He seems fine. But lately, he’s been getting up at night. Sometimes once a night, sometimes not at all and sometimes 4 times a night.

So really… how do i know if he outgrew the reflux and is waking for some other reason OR if he’s in pain and hasn’t outgrown the reflux? Since he’s always been a terrible sleeper… how do i know for sure?