I feel a lot of fluid in my tummy since a few...

How to treat sensation of fullness after drinking

the cause may be gastritis which is unflammation in the wall of the stomch nd it is treated by omeprazole 40 mg once  daily 30 minute befor the breakfast and if there is H pylori infection is present then it is treated by amoxicillin and clarythromycin and omeprazole for 2 weeks and you should avoid spicy foods and soft drinks and smooking and the cause may be irritable bowel syndrome which is treated by mebeverin and some tomes imipramine may be used  

how to diagnose  sensation of fullness after drinking

if no response to the medical treatment within 4 weeks then gastroscopy may be done and sample taken from the stomach to exclude stomach tumors and stool analysis should be done to exclude the presence of H pylori also abdominal ultrasonography should be done done to exclude the presense gallbladder stone

what is the causes of gastritis

spicy foods
soft drinks
smoking
NSAIDS anaelgesics

what is the symptoms of gastritis

stomach pain
loss of appetite
loss of weight
fullness of stomach

advise

you should follow up with gastroenterologist to diagnose the cause and provide treatment