The symptoms your are describing are all favouring acute gastritis. In such a case one has to be very careful in their diet and take appropriate medications to reduce the gastric secretion. You have to develop regular food habits like having four short meals per day. And avoid spicy, oily and outside food for the next few weeks. Also consult a physician or a surgeon who will prescribe you a proton pump inhibitor to reduce gastric secretion and further evaluate for stomach ache.