Well my first response was to take him to the vet asap but since it is closed already that doesn't appear to be an option. You said that you just got him? Do you know what kind of conditions he was kept under before??
The seizures sound like MBD but I am not sure about the blood in the mouth, may have bit his tongue. If you can I would go to the petstore and get exoterras electrodize supplement and give it to him via syringe (read the instructions). I had a beardie(rescue) with MBD who was having seizures and they cleared right up...still take him to the vet as soon as you can this does not sound good.
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