I have chronic excess throat clearing, excess burping, no heartburn. Gastroscopy showed sliding hiatus hernia, is Laryngopharyngeal reflux likely?

LPR . Laryngopharygeal reflux is when a small amount of acid comes up into the throat and irritates it. It is a common cause of dry tickle cough, chronic sore throat, lump in the the throat , post nasal drip, phlegm in the throat, and throat clearing. Many studies show it responds best to proton pump inhibitor rx. It is possible you may have this. See an ENT for evaluation.