Chest pain. Understand what to do.

My mother's is suffering from chest pain from months. The first pain she got was in last December. She took some pain medicine and the pain relaxed. Since last 1-2 months, the pain is continuous now and then. Sometimes the pain gets too much and hot water gives some relief. She says that the pain is in middle of chest with some effect in left part. Our local doctor treated it as a gas problem first and then as a peptic ulcer, but both didn't give her relief. She has been diagnosed with ECG, x-ray and blood test but the doctor said that the report is fine and normal. Then the doctor said for endoscopy and consulting with a heart specialist. We are really confused and we couldn't understand what to do.