It sounds as though you have been suffering, in the past, from allergies and Amalgam fillings. When did you get your first filling? Take over the counter antihistimines when you are feeling depressed or fatigued.
It would seem that you have triggered an over activity in the secretion of digestive juices. You need to take Pepto or Tums, and see what works for you. You also need to find foods that will help you regulate these acids. You might have to eat many times a day. Good Luck.