Let me try to help you out.
1)Get yourself a good drop based test kit .Taylor k2006 or Leslie Pool store equivalent are favorites here.
2)CYA-did you drain and refill some water or have a VERY heavy rain because the only way to lower CYA is a partial drain and refill of pool or like if your pool was half filled and rain water filled the rest
3)CYA of 61(if that's an accurate reading )means you needs to keep chlorine at a minimal level at all time(check Best Guess CYA chart on this forum)
4)Sounds like a chlorine demand...means you must keep chlorine at your shock level and keep it there by testing several times a day and adding chlorine to keep it at shock level until you keep yor minimum free chlorine for your CYA level overnight.

I'm just a newb here but I read and reread most of the threads..you can learn alot.

Do you have vinyl liner pool?,concrete?,how many gallons?Can you get water tested again and post results as soon as you get them?I'm sure one of the great mods like Watermom,Carl D,chemgeek or any other will be by to help out any time now.

BTW Welcome!