How can I deal wiith case of acute gastritis in emergency department?

??? If you go to ED I am sure the doctors will help you to deal with it. Depending on the severity - if mild you could try dietary changes like no alcohol, no smoking, no spicy or greasy foods for a bit. Choose more easily digestable items- bananas, cracker, bread and clear liquids to see if you get relief. In addition OTC Maalox or Zantac (ranitidine) may be helpful but do not choose meds over diet change.