I feel Chest Tightness And short Breath.

I had an appendix operation 2 weeks back. Before operation i felt that I can't breath properly and shortness in breathing.so i admit in hospital and operated but after that breath issue was in good condition. But from last 2 3 days I just can't breath properly again and I thought it was because of gas ,acidity reflex, so I went to gestrologist..He gave me tablet before food and sucrafil gel. And suggested to see cardiologist and urologist for 5mm stone in left kidney.. but when I got operated ECG and Chest x-ray done. It was normal. And they given me neeri tablets for my stone issue..But after 2 days of taking medicine i still feel chest tightness. So which doctor should I meet.. gestrplogist can't do anything.. if I go to cardiologist then they will again check ECG and x-ray.. if it's normal again then what should be the problem. Please help me. Which doctor should I see. For proper treatment.