Hi Pamela,
Does the pot have any drainage holes? If you've overwatered it and there isn't enough drainage, then the plant will be effectively sitting in a bucket of water and drowning. If there's no drainage holes, try carefully tipping the pot on its side to let the water run out (you'll need to hold the dirt/potting mix in whilst you do this).
Can you tell us what fertilised it with and how strong it was?
