First
....your plants look like some of mine.....which is somewhat normal for a sliding door situation.....do not panic...I have sliding doors and a few of mine are growing in the same situation.......and are freezing their corms off.
Plants withdrawn from optimal growing conditions (full sun)will do this.
Second....all the previous posts are spot on with your indoor issue....no sun to grow the plant and too much water....will slowly kill your plant
Third...
Indoor growers will tend to overwater anytime the plants leaves start to turn brown or yellow, wilt, stop growing.....Do the opposite, less water more light and as much heat as you can will help your plants over the winter is key.
Have fun...
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image by
Hostafarian,
on Flickr