My cat is so not himself

Just got home from work to find my cat hiding in a corner looking really unhappy.  He's ok for me to pick him up and even purrs when I stroke him but he just keeps giving these little half yawns every so often.  was wondering if it's because the bengal cat over the road has been bullying him again or if it may be more serious.

Could be either the cat bullying him or something more serious.
Watch to see if he's peeing/pooping/eating normally, though expect a decrease in appetite if either.
Can you shut blinds so your cat doesn't see the Bengal cat?

If your cat is indoors and hiding in a corner, it wouldn't be due to the bully across the street, he knows he is safe inside.

No, I would guess he isn't feeling well.

Really want to watch him for signs/symptoms now since, if he does have something going on you will want to catch it early.

Thanks, took him to the vet and he had blades of grass stuck in his nasal passage.  The vet operated to take them out, (they were huge) and he's now a different moggy.  Didn't like the thermometer up his bottom though.