Sounds like a bad case of transplant shock. The top growth may be alive, but there is no functional root system at this point. You'll just have to sit tight and see if the tree manages to get established. Fertilizing will only make things worse. Make sure that there is adequate water to the developing root zone, but don't drown it.

I agree with the above. I think the tree was not well kept in the bare root condition and was stressed when you bought it. Al