Is she old enough ??????????

Hi there not sure if my little one is classed as an older child with reflux or not.
She is now 15 months old. At the moment she is only taking Omeprozole 10mg and 1ml of gaviscon advanced 3 times aday before meals.
We thought resently that her reflux seems pretty much under control, almost at an end (WISHING). But over the last month i have become increasingly worried. This whole bussness about Lactose intolarence and milk alegies... (Im so confused). She has had a Lactose test at around 5 wks, shortly after being diagnosed it was negative, but there are little signs that are making me wonder. Can the test be wrong, or can things change as they age. It only been around a month since the domperidone was stopped.
After reading the post on here about sleeping habbits, night waking, night drinking, moaning and crying like in pain while sleeping.... waking still sleepy, easy moody, and on and on fits her to a T. Im at a real loss. Can any one please give me there benefit of there wisdom. I feel like i have coped with refluxing for so long now, and im so scared it could all be coming back.