Hi Marco-
Ross is right that after surgery you can have a lot of fluid on board. I've forgotten how far out you are from your surgical date. It seems that you must be at least a couple of months, right (I've been dealing with some pretty intense problems with Joe and I've lost track of time). That seems a little long to still have fluid retention. Do they have you on a diuretic (Lasix, furosemide, Aldactone, spironolactone, etc.).
I wouldn't wait on this problem. Get on the phone with your cardiologist and if you are short of breath and cannot get the doctor, go to the ER. The thing you will want to rule out is congestive heart failure, which sounds terrible, but is treatable. If you have fluid in your lungs that can cause the SOB. There is a new blood test which can determine if you have congestive heart failure, also they can do a chest x-ray. If you do, they can give you IV diuretic and get the fluid off fast. Joe has had to go and have this done a few times. If it is fluid, once you get rid of it, you will feel a lot better, then your card. can give you meds and a diet plan (low sodium) to keep the fluid off.
Just don't wait on it, though, Marco. Because it can start to accumulate more and more, and it can go into other organs, plus give you edema in your legs.
Joe's been dealing with congestive heart failure for many, many years. There is always something the doctors can do to make you feel better.
Take care, and God bless.