Peace lily--underwatered or rotting?
I bought a peace lily about a month and a half ago, and everything was fine until a few days ago, when I noticed a number of yellow and brown leaves at the base. I hadn't watered it in a long time, maybe a couple weeks--I'd read that I should wait for the leaves to droop, and they never did. I thought maybe it needed water, so I watered it. Then I read that yellow leaves at the base could mean root rot. It's possible that when I first got it I overwatered it. I have a tendency to do that.
Is there anything I should do at this point? I may have just made the problem worse.
I should note that it's unlikely it's getting too much light. My apartment faces onto a courtyard surrounded by other tall buildings, so it's pretty dim in my apartment. Any light it does get is indirect. I keep the plant about five feet from the window.