I have had 3 reflux babies, none medicted
I would get her checked again. it never caused the bring the leg up crys ( I think that was more colic) but it can really make life miserable.
all 3 of mine lived in a carrier for hours ever day, just so I could get stuff done.
if her twins asleep now could you pop her in bed with you? -do you know co-sleeping guides? don't share blankets with baby etc?