As above.
Im 53 years old and have had dogs for all of those years, but if the dog was ill it would go to the vets. Same with the ferrets.
you go to the vet to seek his advice and treatment, however if you have seen it before and know how to treat it, then his advice is not needed
But if you are on here or any of the many other forums asking advice, then you don't know or you would not be asking?.
but there might be people who do know, thats how a forum works
But in the time that passes the poor old ferret is left to suffer.