Thank you for the query.
If the opening of your stomach was too narrow, this is the most probable reason of your symptoms. You can not leave it alone as it can indicate the stomach cancer
. It is strongly advisable for you to have abdominal CT with contrast or at least abdominal X-ray
with oral contrast. Depending of the results of this tests, surgery might be necessary.
Chest pressure should be always ruled out with heart problems. You should have at least heart ECG and heart enzymes checked (CK-MB and Troponine).
Hope this will help.