OK we took Krissy on a walk to our local park where they play music on Thursday nights. She was not eating at all but got very excited. She fell down twice, the first time I picked her up right away and she was fine. The second time she was with my husband and she layed there for a minute and it seemed like hours! She got up like nothing was wrong.
I guess it is back to the vet to see if it is something treatable.
I finally found this web site and it explains exactly what is happening. I will print the info for the vet:
Dog Fainting or collapse
Pray Krissy will be OK............