What to eat when having gastric?

its been a week and i only went to see the doctor last 2 days bcoz at 1st i didnt noticed that im having gastric for da 2nd time (poor me).. since it started with the hard pain in my lower abdomen and so i tot it was just a constipation :P I think the causes of this misery might be the cough pills and aspirin that i used to lulled me to sleep (almost everynite!) plus unorganized eating time habit haha. Ouch..so can u guyz plz advise me what to eat what not. Perhaps the diet plan would be good. 10Q, Id appreciate it very much ;)