Swelling? Water retention?

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Anyone else struggle with this? My doctor had to put my on Lasix waterpills to keep my swelling out of my feet and legs. (my calfs measured at 18" friday when they were swollen after the first pill saturday they are down to 16.5". He's ruled out everything - so I see a vein doctor within a month to have that checked. Just curious if anyone else that's trying to lose weight is having this issue? (I peed out 5lbs of water friday night - sat morning - thats just crazy!! )