You only been off it for a few days, wait another week, estrogen will stay elevated for a while but that's not a reason to hammer a ai if water retention is the only side effect, if it's water weight something as simple as dropping carbs for 2-3 days while drinking a ton of water will help flush most of it out, if nothing changes after that, it's more likely fat then it is water. Dandelion tea or Dandelion root supplement for a day or 2 would also help but don't use that long term.