Gerd , acid reflux. Why it so?

Hi doctor as per my symptoms with acid reflux, flatulence and burning sensation in stomach and chest, pain in thoracic region doctor suspected that Iam having gerd since 30 th march Iam taking different ppi such as omeprazole Pantoprazole and one more ppi I don't remember the name exactly with different concentration and I feel sometimes difficult in breathing especially in night times some nights I can't able to sleep after taking ppi and endial digest I'm OK but what bothering me is I lose my weight and especially in the nights I have a lot of flatulence why it so? May I know the reason even I just eat plain rice boiled veggies and without spice and cooked chicken no masala totally avoided please help me