GERD & pain in chest and abdomen. To do.

I've been suffering from GERD(no chest burn) for 7 months.I am recovered a lot but it is not completely cured.As per doctor my symptoms are of gastritis so I'm following changed life style for preventing it.But for last 1 & half  month I'm feeling heaviness in chest region and left upper abdomen pain below rib.these pain is sharp n deep pain for small duration.i have done with G I endoscopy 3 months before & report is normal.another thing I have been diagnosed with 4 mm kidney stone in left side 3months before.the abdomen pain is like wound is there & feel when food passes through it.Chest burning is very low but lungs & heart regions becomes heavy & gives sometimes deep minute pain.also I'm feel pain like nerves below both clavicle is getting blocked.Antacids creating watery feeling in stomach so I stopped it.I want know is it something serious thing behind the symptoms.I've divided my food into five times a day with small amount due to digestive issue.please suggest what to do.