Hello . Well since all the other symptoms are ruled out it is gastritis only or may be panic attacks...please take gastric tabs for atleast a month..you need to have food on time..do not wait till hunger pangs.maintain proper time. Divide your meal time to small proportions so that you dont over eat..secondly drink lots of water. ..atleast 8-10 glasses per day . thirdly.. You need to stroll for a min of 15 min after each meal...stress,tension,all these are also factors of acidity...avoid outside food,junk and oily food...better to have gone cooked food for few days...if it doesn't resolve then better see a physician as panic attacks can also cause such symptoms...thank you