I see why it'd be a pain for you, but feel like this process of handing over a supposedly pixel-perfect design is inherently broken - without collaboration the design will be dead as handed over - it should be changing constantly as you encounter difficulties, first in translation to templates, then in putting in content.

Specifying text sizes in a PSD is insane! It doesn't even have styles so I see why the designer hadn't bothered. I think I'd honestly prefer to receive a hand-drawn image with scribbles for the different text sizes.