I'm sorry you are in such pain. I also get the swelling in my legs and then my lungs get full and I start having breathing problems. They check my kidneys because I have retention since my fusion surgery in 2005. My blood pressure goes up. The pain gets bad and I increase my Norco and then it is one circle of problems. The Norco cause breathing problems, oxygen slows down so circulation is effected. It's just one big circle of agony. I have gone on trips and then have to suffer for weeks with the swelling and the pain. I wish they would just figure out what is wrong with us, fix it, and let us go on with our lives. I hope you find some relief soon.