GERD for a long period of time can cause inflammation and narrowing of esophagus.
The other complicatiosn that can be expected are sore throat, cough, aspiration pneumonitis, hoarseness of voice, dental erosion, Barrett's esophagus and malignancy.
Do you have other issues like coughing, swallowing problems, choking, sore throat, sinus or ear issues? It could be silent GERD without heartburn.
The medicines you are taking covers also GERD and not just your diagnosed esophagitis and gastritis. So maybe you need to consult your doctor about adjusting your dosage.
Have you tried natural alternatives? Some of them might help you and will enable you to reduce some of the meds you are taking. Aloe Vera juice and DGL Liquorice can be agood starting point.