Repetitive severe pain in the upper abdomen or lower chest might be related to several possible conditions.
The pain might originate from the stomach. Data about decreased or increased pain after eating might indicate stomach or duodenal chronic inflammation or an ulcer.
The pain in the chest might also be related to a heart condition. The problem is that if you are not at the doctor at the moment the pain occurs, the ECG might not show irregularities. Cardiac problems might originate from physical and/or emotional stress. But you should also consult with your gynecologist about the possible side-effects of the birth control pills you take, because they can cause an embolism in coronary blood vessels which can be fatal.
In the end, a pain in the area you described might originate from pleural inflammation. A physical examination and an X-ray might solve the diagnostic dilemma.