I agree with everything said by Homebody and Bogertophis.
Having him in a clean isolation cage is a good thing.
Even though we recommend discontinuing the eucalyptus oil, please mention it and what you did to the vet. There's a chance that the bloating can be related to oil toxicity.
Sadly, a lot of the medication that we use can be problematic to our pets. Something as simple as Tylenol is extremely dangerous to cats as an example. The vapor rub may make us feel better and some tree oils are used to medicate fish tanks, but can be dangerous to small animals like rabbits, small rodents or our snakes.