Go explore some dungeon if you can't run past the hydra, probably. Maybe most of orc. You could stand some utility spells and probably mystic blast (at least until bolt is hungerless, I guess.). You can safely ditch fire brand if you need some spell levels (why do you even have fire brand, anyway?).
If you can get some range on the hydra, though, you should be able to just fire bolt it down.
Also, you're, uh, not even remotely heading for dragon form? You're a draconian; dform is pure transmutation for them, not transmutation/fire. You have zero tmut