Breathing Difficulty With Chest Pain. Feeling Uncomfortable After Eating. Heart Disease?

grandma was having difficulty breathing . she almost went breathless until she took a seat and kept calm. she looked totally pale that night. she had a chest pain on her left hand side last night too, but after rubbing some ointment on it, she said she felt much better. she preferred to sleep sitting at the sofa instead of lying down on her bed. last few months, she claimed that she had gastric pain, each time she finishes her dinner, she feels uneasy and her stomach gives her an uncomfortable feeling. Is this a heart disease case or more to a gastric case? Can gastric