Drink lots of fluids to replace what you've lost & supplement what you'll lose with the burn & blisters, take a good multivitamin too.
I've never heard of the hot shower thing & baking soda, I think it'd really hurt & then the baking soda would suck the fluid from your already traumatized skin.
Stick with the topical spray anesthetic for temporary relief, asprin, aloe gel, fluids, and don't forget the sunscreen next time