Hi,
The symptoms and treatment that you are recieving indicate that you have suffered from either angina (mild heart attack) or a full fledged heart attack. Nitro and isosorbide mononitrate are given to patients suffering from a heart ailment. In Pancreatitis there is increase in Serum Lipase and Serum Amylase levels. Also there is some amount of fluid in the abdomen. A patient of Pancreatitis is put on Intarvenous drugs with a tube through the nose to aspirate all stomach contents. Patient is usually off and oral food and liquids for few days.
Endocarditis and myocarditis have totally different symptoms than yours. Read more
here and
hereI would advise you to consult a cardiologist. The treatment you are on does not seem to be adequate. There might be requirement of revision of dosage of present medicines or addition of some other medicines.
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Regards
Dr. Gupta