Most Helpful Guy
You should get your cat certified as a service pet for
helping you cope with anxiety, stress, depression and
you should be allowed to take him to where your going
service animals have to be allowed according to law
if you get a doctor to write you need your cat it should
go through for you.
Most Helpful Girl
Register them as an emotional support animal and it'll be illegal for anyone to refuse you for that.
My mom did that with one of our pets.
(at least in the US I don't know if that'll work in other countries)