Leela, don't panic. I have killed my share of Phals, it happens. If you didn't kill a few you would never learn. Here's the weird thing for me, every orchid that I have bought with a yellow flower, and not just Phals, has died on me. The rest are fine and growing, go figure. I will conquer this problem eventually
, and if this doesn't save the plant, you can get another and try again, or just get another to keep it company while it slowly recovers lol.