killing my house plant

i've a an anthedesia white in my attic room, with what i'm told is enough light.

i recently overwatered it quite badly and it's not looking well, lot of necrosis in the leaves, leaves becoming flowers are turning brown instead of white.

I'm yet to repot it in new soil but have added some fertilizer to it (again i'm assured its the right fertilizer)

So basically, HELP!

 

Hello Guynamo and welcome to Gardeners Corner.
I know the plant you mean.
The correct course of action for a plant that has been drowned is to remove the plant from the pot, remove as much of the sodden compost as you can from the root area and replant it in dry compost. This will work for some plants and they will recover. Feeding will not improve the situation.

I don't want to be a merchant of doom and gloom but my experience of Anthedesia is that if they have gone past their best with spoiled leaves etc they never come back to worthwhile condition. But maybe someone else has something different to suggest. See what they say and good luck.

 

Nothing to add to Alice's good advice but in case anyone does not recognise the name, it is a type of Anthurium (Flamingo Flower).