Dying indoor tomato plant...?

I recently moved my tomato plant to a larger pot with compost ... a few days later the plant started to wilt away. I noticed water was remaining at the bottom of the saucer, so I lifted up the pot with tiles so that the water will totally drain. The plant has not revived even after I did it .... the plant is wilting, and the leaves have some white-grayish spots. I think they are blight. I want the plant to come back to life. Any suggestions?