Peace lily - newbie needs urgent help

you do know not to touch the leaves of a peace lily, right? how big was the plant before you repotted it? you are right about the sunlight. in my experience, they don't care for it too much, just a little in-direct light is good enough for them. i don't usually thin out peace lillies, just move them up to a larger pot or basket.

No, "food" won't do any good here (it's generally not a good idea to fertilize a stressed plant, unless the stress truly is a mineral deficiency)

Have you been overwatering? Do the roots fill at least 2/3 of the pot?

If the root ball is small in relation to the pot size, uproot them, wash off the roots, and repot in a smaller pot with fresh soil.

It's fairly normal to loose a few leaves when splitting a plant, but your trouble makes me think root rot, though I'm going more on gut feeling than real evidence here.

I have never heard this before. I have a couple of peace lilies and am curious as to why one should not touch the leaves. Would you elaborate on this for me? Thank you.

Well, I don't know if it's fact or not, but I have seen the results of this. It's something that I've heard all my life. (my grandmother kept peace lilies around all the time.) Have you ever noticed the black/brown spots wherever the leaves have been touched? I was told that touching the leaves causes the spots. Something about the oils of the skin being "poison-like" to the plant. When you touch it, it also rubs off the natural, protective oils of the plant. I was also taught to trim the brown tips of the leaves with scissors. Like I said, don't know if it's a "science-proven" fact. But I can tell a difference in the peace lilies I've cared for. The leaves stay green and healthy looking.