You must be back to your Hospital to get treatment for Helicobacter pylori infection
that untreated may contribute and aggravate gastritis
even G-D ulcer. Very important is your diet, try avoid spicy, hot food, rice, fatty food and increase intake of fruits, vegetables, salads. Regarding white blood cells , you need definitely recheck your blood work and if is again abnormal, you may seek Hematologist
consultation for properly advice.