Severe GERD from 12 months. Altogether?

I'm having GERD since 12 months an taking Rabium DSR which is rabeprazole 20mg & 30mg domperidone 2 Time a day daily still have GERD issue which is partially resolve,Till when should I continue this medicine bcoz I cant take risk of dropping medicine at this stage where 80 percent of symptoms are disappeared of GERD an it was horrible..I had see severe back pain, nausea, heart burn, food comes up,dry mouth, burp,however right now I don't feel any of the above symptoms apart from heart burn sometime a day that make me feel somehow acidity is managing to come up, I feel improvement bcoz I follow lifestyle strictly with diet..But what to do of medicine?Sacred of leaving medicine an everything come up altogether?it has taken 12 Months to resolve I don't know but if I face such situation again then I would have no choice to go nissen fandoplication surgery,Note : No HPylori, very less wheight, Advice an suggestion is Highly appreciated also will consult if required.Sir,plz help on priority.