Please help!

My fox squirrel, Bean (nearly 4 months), has been lethargic today with some lack of appetite. The only thing he wants is fruit. I have offered HHB and HPB but he only nibbles at them and drops them.

His usual diet consists of:

Henry’s Squirrel Block (2-3 a day)
Brussel sprouts
Chayote
Cabbage (green and red)
Squash
Zucchini
Blueberries (one a day)
Cranberries (two a day)
Almonds (two a day)

With his almonds and fruits I usually add Henry’s calcium powder to coat them.

Right now, when I pick him up, all he wants are cuddles. He just wants to sleep, which isn’t like him. He is usually pretty active and playful. This change literally happened overnight. Usually he greets me in the mornings, but today he couldn’t get out of his nest.

He also has slightly runny stools. They’re still holding their shape, but they’re not the usual pellet shape.

If anyone has any insight to what this could be, please let me know.

Thank you!