I am sorry for your terrible experience, but it is absolutely not true that there are no false positives. I had a false positive on a kitten just a few months ago. The first thing I would do is to find a different vet.
There are people here who will be able to give you more and better information, but I can tell you there are absolutely false positives.
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Vist the Austin Siamese Rescue store and save a kitty life!
http://www.cafepress.com/austinsiamese
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Vist the Austin Siamese Rescue store and save a kitty life!
http://www.cafepress.com/austinsiamese