Hi, with the losec, how long was he on it for? as it can take up to 3 weeks for it to be effective as the previous damage to their osophageous needs to heal first before there is relief. He also may have needed a higher dose. My daughters dosage was constantly being upped due to worsening reflux and also weight gain.
only sleeping short sleeps is def related to reflux too. <My daughter didn't sleep longer than this till she was almost 1 when we finally got her reflux under control.

Also with the lactose free formula, it may not be lactose intolerant he may have a milk protein intolerance which is different to lactose intolerance. My son is on a formula called Neocate it is a formula that you get on prescription.