It's definitely something to come down from. What helps a lot of people (and does for me) is to find some low-stress productivity. Do the grocery shopping, some yardwork, etc. Or if you miss the intellectual connections, wander the stacks of the closest library...grab a few books from a section you're unfamiliar with and just skim. (My favorites are books that are illustrated catalogs of things..."Perennials of North America" kind of stuff. It starts off mindless and then you get sucked into the details of someone else's passion.) Reading poetry is another good one; I go with brilliant poets who use plain speech, like Jack Gilbert: https://www.amazon.com/Refusing-Heaven-Jack-Gilbert/dp/037571085X