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My name is ***** ***** I have been a Vet tech for 30+ years.
Can you tell me is there any head tilt?
Did the Vet check the ear?
Do the eyes Dart?
Does he walk like drunk?
Does he have problems with ear infections?
Did the Vet do any blood work?
The way you described the problem sounded like toxicity, seizure or vestibular issue. Without blood work it is impossible to determine what the cause was. In any case you have said the cat is doing better. The drooling is seen when nauseaus. With vestibular issues that is the part of the inner ear that allows all creatures to maintain balance. We see eyes dart, the drooling, the inability to walk normal and the falling over. Vestibular issues can be from toxins or other or can be idiopatic. We some times call it Old Cat or Dog disorder. You can read more about Vestibular Disorder here:
I would talk with the Vet about this and I would also have some blood work done.
I had posted an answer, but do not know if you had seen it. This is what I suspected:
Checking in to see how your little one is doing? Would love an update.