Next time your do your CYA test, mix 1/4 cup pool water with 1/2 cup tap water. Test, and then multiply x3 for your actual CYA level.

Do NOT buy any more stabilized chlorine -- dichlor or trichlor, in any form.

Do go ahead and add more chlorine ASAP -- I can't tell you how much, because I don't have your equipment form yet!

Also read about muriatic acid, and lowering alkalinity . . . because you're gonna need that:
http://pool9.net/ma/
http://pool9.net/alk-step/