He seems to be getting worse, not better.

He's eating, but just little bits of this and that and when I give him
one thing, he takes a bite, then stops.

He's sleeping a LOT, much more than usual. He's very clingy and crying
a lot. (I can handle the cling, and just kind of carry him around with
me)

I had to go to the store for a bit today, which was the first time I've
left home since Dmitri died. (Though we left the house to take Dmitri's
body to the crematory...that morning is all a haze in my mind) Jack was
waiting at the window for me. That's not typical at all. He didn't care
about the bags of stuff (that was one thing they did when I returned
from shopping, rush in to see if there was something for them), just
wanted on my lap.

He got mad and flung litter all over the place, then turned his box
over. (Again, not something he does)

I bought him a new toy and he just wasn't interested, which is okay.
Maybe later, or maybe I'll take it back.

Then he was sleeping in his tower bed, and sometimes he likes to hang
out of the entrance cutout, his head and upper shoulders hanging out in
an odd position. He does that sometimes. But today, he actually let his
body fall out (the top half) onto the top stair of the tower. It didn't
even wake him up. He woke up when I ran over to him and then curled
back up into a ball. But I mean he literally let his top body fall out
of the bed and hit the stair.

And when he's awake, he just goes from one place to another, crying and
whining, and I try to feed him, doesn't want that, play, nope. Usually
just picking him up and holding him tight against my chest will settle
him down.

I know he's mourning, and I know he's really missing his big brother
(we both are), but I'm starting to get worried about him.

Am I doing anything wrong? Is there anything I can do to make this
easier on him? It's really breaking my heart. My poor boy.

Thanks, Juls

p.s. The only time he really seems at peace is in the evening when he
takes over the cat bed and curls up. This is the time he would "steal"
the bed from Dmitri. When I go to bed, he joins me.

And he does purr when I'm loving him.