I also have swelling in my feet and legs, although not as much as you because I use a simple diuretic and I assume lasix is much stronger. Mine never completely goes away and it gets worse when I fly on an airplane, eat salty food, or am on my feet for too long. I've had this problem for over 20 years and my doc isn't concerned about it. It's a drag, though. I have no idea what causes it. I don't have kidney problems or any other organ involvement.
I'd be curious if you find out anything.
By the way, welcome to the forum. I hope you'll join us -- we love to meet new people and all learn from each other.
SLE, fibro, renauds, restless leg, hiatal hernia, double vision, migraines, costocondritis.
prednisone, plaquenil, leflunomide, neurontin, synthroid, triamterene, actonel, niaspan, tri-est, cymbalta, tricor, acifex