Answer: If the roots are damaged from too much water, you'll have to wait and see if the plant recovers. Other than allowing the soil to dry out some, there's nothing you can do. (Don't let the soil dry out completely; keep it slightly moist. Too little water is as bad as too much water.) If it's really all droopy and wilted, I'm afraid the root damage may have been extensive. But I'd wait a little while and hope for the best.
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