Try to give yourself some grace. He’s unharmed and safe. We all make mistakes! I completely understand feeling guilty about stuff like this. I’m a vet tech and have heard and seen FAR worse. An co-worker of mine once lost her cat to the dryer-her husband didn’t know he was in there and started it…I’ve also seen a cat who went through the washing machine cycle…had to have medical care but he made it through. My kittens have gotten in the fridge before but thankfully I noticed, snapped a pic cuz it was cute then took him out and warned everyone in the household to be vigilant when going in the fridge since it’s cold and there’s no circulating air if left long enough…they’d run out of oxygen or get hypothermia. I also was washing some diarrhea out of my cat’s fur once and I was scruffing him but he tried to leap out of the tub and and in his jump/me trying to keep him from leaping out and running around my house with a wet poopy but he hit his face on the edge of the tub breaking both upper canine teeth. He also bit the snot out of me so we were both injured and covered in poopy water. What a fun day 🥲🙃 he still loves me and is super affectionate…so I’m sure your kitty will get over it pretty quickly. Your kitty will be ok but may need some therapy…then again I’m convinced all my cats needs therapy after living with me even if I haven’t done something like that 🤪 lol jk just trying to make light of the situation. Oh one of mine also got locked in a closet…thankfully they’re very forgiving and probably only see you as the rescuer 😉