Resting and hiding can look the same from the outside. Only you know which one it is.

Both involve staying in, and from outside nobody can tell them apart, which means no useful feedback is coming from anyone else. The difference is internal. Rest restores something and ends by itself; hiding grows, gets harder to come out of, and usually has a specific thing waiting on the other side of the door.

Ask what would happen if you went back out the day after tomorrow. If the answer is nothing much, this is rest and you should take it properly. If a particular face or task comes to mind, that is the thing, and naming it beats waiting it out.