I got the Bissell out again and this time I filled the water chamber with bleach and hot water. I realized it was risky, but I couldn't live in a house that looked like a bunch of camels hung out (even though a friend said I could redecorate with palm trees and such). So I ran the Bissell quickly over all of the yellowed areas.
Whah lah!! Stains gone. I then kept going over the entire carpet with the bleech water so the carpet would match evenly. I have to say they turned out great. I have my old carpet back (you know the carptet I thought I hated). I love it today. I don't even mind the faint green outline where the oil paint had been two weeks ago. It is a miracle.