What Causes Swelling In The Ankle Along With Breathlessness?

I have no heart trouble as have been tested this year and tests were fine. I have COPD but it is controlled by inhalers and oxygen at night. The past two weeks, I have had problems of shortness of breath and swelling in my ankles and feet. I went to my MD and he said my sodium was very low and not to take diuretics any more than necessary. Three years ago I was found to have a blockage in my upper left leg and I had it corrected. An aneurism developed and when they fixed it, all the blood drained into my leg and caused it to be bruised and twice it s size for several months. I am left using a cane and having this problem. What can I do to help this condition. My cardiologist can find no problem.