Hello After going through your history of illness mentioned in the query , you are a patient of hypo thyroid, hyper , anxiety , pcod , and history of smoking also present. But main symptoms which you are facing since you were 16 years age , these ( gastritis type ) symptoms may be due to these possibilities , these includes. 1 The first possibility is of peptic ulcer disease or Hiatus hernia . Diagnosis can be confirmed by G I endoscopy . Try raising the head of your bed about 4 inches with blocks . It also might help to avoid eating or drinking for 2 hours before you lie down . To help control stomach acid one should not drink alcohol or drinks with caffeine in them or eat chocolate or spicy or greasy foods . Take antacid but if symptoms are severe you may need drugs like pantoprazole. 2 The next possibility may be of tension , so please avoid as your history of illness is also an indication of these symptoms. Deal as mentioned above and you will be disease free. Good luck.