My boy as been acting very...strange the last few days. He's 4 years old, 6 pounds, male, and has a "quirky" personality. But on and off for the past 2 weeks or so he's just been acting really weird, for lack of a better word. He's been hanging out under the couch and today he's been refusing to leave my closet, which he's never done before. He's also been acting very anxious, a little scared maybe, and oddly distant? He's pretty self-sufficient and used to my busy schedule, but when I'm feeling especially stressed he's usually extra cuddly and goofy. I'm about to move and currently studying for medical school entrance exams, which I'm sure contributes to it, but his behavior has just grown worrisome. I gave him a treat and he acted fine, then immediately redirected to the closet. And when I opened the door to let a guest out, he tried to run out, which he also has never done before. I was just wondering if anyone else has experienced this sort of thing, if there's an underlying issue, if I should be worried or not, and if there's anything I can do for him?
Any advice would be great!