I am sorry your boy is not himself.He may be hurt, in pain, sick or scared.
Take him out of the corner and check him over. Look in his mouth for a stuck item or any abnormalities. Feel all over his body for any pain response.
Make sure he is able to pee and poop.
Rub a drop of pancake syrup or honey into his gums in case he is hypoglycemic.
Offer him tuna, canned food, or milk. Warm the food to bring out the aroma.
Please let me know if he eats or drinks anything. And if you discover anything out of the ordinary.
If he refuses all food, has any obvious injury or cannot urinate, he should be seen.
Please be so kind as to rate my answer positively as that is the only way I receive credit for my assistance. Thank you very much!
If you need any additional information, just click reply and I will be here for you and your fur baby.. Rating will not cut off our communication. This question will always be open for you to reply to me.