My dr is not so sure that lpr is a real thing and if you go on line some sites claim that lpr might be something over diagnosed. If you are on ppis for 2 months and it doesn’t help I would think it’s not acid reflux. Diet should help and sleeping propped up should help but it doesn’t address the underlying cause. That is the big question. Ent drs think it’s sinus and gastro drs think it’s acid reflux. Good luck