It all depends on your risk tolerance and perceived threat model.
I would recommend that if you do use Proton Pass in conjunction with your email, keep a backup KeePass file stored locally and in a few other places and update routinely.
The Proton ecosystem definitely doesn’t fit everyone’s security model, but it is a massive leap compared to what Google and Apple offer.
Best wishes for a recovery. Thank you for being such a great human being to your cat.