How can I get the extreme edema off my legs and feet?

Hello, first, you need to have a serious and immediate discussion with your medical provider prescribing the Suboxone; swelling or peripheral edema, could mean or be a sign of an allergic reaction to the Suboxone, and there is a high risk, if this is happening, you are at high, high risk for severe reaction called anaphyaxis, which is life threatening and could easily result in death if not given emergent attention.
If your provider and yourself, that this edema isn't related or allergically mediated, has no relation to the Suboxone, and your focus turns to your edema. You may want to ask your provider about a different diuretic instead of Lasix, maybe something such as Bumex, which tends to work very effectively. But before taking such step (s), discuss with your provider. Best Regards, Cindy