Any advice on how to keep my cat sane during this rough period?

We have a 13 year old male cat who is usually very chill and loving, but a bit of a wuss. He’s an indoor cat and is scared of the outdoors and mews his little head off when he has to be taken to the vet’s.

We just had to have his sister put to sleep a few days ago; they had never been apart before. And now we’re moving in a few days. This is a lot of big change at once and I’m a little worried it will affect him badly. We’ve been moving furniture around and he seems to be on edge. He hissed at me and tried to bite me earlier for pulling a pencil out from under him that he was lying on top of, and that’s not like him.

We bought some Feliway pheromone diffusers for the new house that are supposed to relax cats. Also when we get to the new house, we’re going to keep him in one room out of the way for a bit while the house is in disarray, so he’s not in the middle of all the chaos. We’ll provide some blankets with his scent on them. Any other tips?