I would be frustrated too. I’ve had one vet that was wonderful about sending me copies of the blood work via email but it seems that that some consider them state secrets.
If its any consolation, I think blood work would have to come back pretty bad for any vet I’ve ever used to not do a dental.
There is nothing wrong with postponing it until you get a chance to talk to your vet in more detail about more diagnostics and the blood work.
I hope you get more answers soon and that the blood work isn’t as bad as they originally indicated.