Pain and burn at cheat and heart.

Sir, my mother is suffering from heart and chest pain with littlle bit burn since 05 months. We visited a cardiologist and took the medication. Even after three months also there is no improvement and the same pian is continuing. Some time she complains that her heart is becoming 100 kilos weight and feel that she is bearing the weight. Cardiologist suggested for angiography and we thought it is gastric pain and we visited another doctor. He suggested for TMT and some other blood tests and the TMT report was little bit abnormal with minor issues. Now we totally still in confuse that that pain caused by gastric or there is really a heart complaint?. This another doctor also suggested us may be angiography need. But we are so afraid for that sir. Pls tell what to do sir. Is TMT not enough for find the problem? Or angiography really need ? We are always thinking to go to cardiologist or gastroenterologist ? Is the problem curable or not sir.? Pls...tell us sir. We are so much afraid.