I see that you are in York, PA. I'm from Central, PA also, with all the farms in this area, your water is bound to be screwed up from run off, especially if it is well water. If you do have well water, I would have it professionally checked for your health, there can be much worse things than ammonia in that water(but that's not about your fish) ....
I love this forum, they gave me great advice and helped me start up my tank and get the right products I needed. I think all the advice here on this thread is correct. But maybe since you are in a dire situation, waiting for replys on a forum isn't the best thing for you right now. May be a little hands on and face to face advice might be better.
There is a great fish store in Lancaster called That Fish Place. Very well known across PA and the region, and luckily they are right in your backyard. They have a lot of knowledge there and can help you test your tank and tap water properly, give you good advice as to what is happening and how to fix it. I found them to be a good group there, and they seem to want their customers to be enthusiastic hobbiests, not just sell a tank and fish (plus they have some cool tanks set up, to look at). It doesn't hurt to stop in.
Just don't leave with more fish ... yet