i have this too. i go mad when i'm inside too long. i start pacing around the flat for no reason. my flat is on the ground floor so it's extra terrible, there's no place in my flat from which i can see the sky. i always have to keep the lights on.don't recognise this at all, no way could i stay inside for one entire day, i'd go mad, going for a walk is all part of the struggle against inertia and hopelessness for me
You Told us you hadn't left the house since December last last year?I've gone a week or two without going out in the past. It didn't bother me too much, but every so often I'd lean out the window just to breathe in some cold air.