Discomfort in upper abdomen. Have ulcer?

I have persistent discomfort in my upper abdomen since last 4 months. Sometimes it is less, sometimes it is more. This feeling includes - pain in centre of upper abdomen - discomfort in upper abdomen - Sometimes feeling of food not getting settled down in upper abdomen - Sometimes burning feeling I visited nearby gastroenterologist and he diagnosed it as Acidity and prescribed me Nexpro 40 for 30 days and Nexpro RD 40 for 15 days thereafter. I felt somewhat better by this but not up to the mark. I asked him whether i have ulcer? so he told NO and further told that we can do endoscopy to detect H. pylori infection. I have not yet done endoscopy. He also asked to do Thyroid test where my TSH came high i.e. 8.2. He prescribed me Thyronorm 25mg and told that Acidity issue can be due to Hypothyroidism. However i have not yet started thyroid medicine as i am not feeling any symptoms. As i am not yet feeling good, i am scared whether he diagnosed my illness correct or not. Please suggest