The most important problem you have is obesity, if you can reduce your weight to normal, I am sure most of the problem will improve, but before you can undergo that, kindly follow what your cardiologist says to you. Cardiac issues should be ruled out.
Next Steps
Once cardiac part is good, keep the cardiologist and pulmonologist Informed about your intention of weight loss and take their advices whenever needed, consult a good dietician and physical trainer. You require a multidisciplinary help.
Health Tips
If you continue to have the same kind of life style you are at risk of many diseases, so take action.