To a hikikomori, winter is painful because everything feels cold, frozen over, and lonely. To a hikikomori, spring is also painful because everyone is in a good mood and therefore enviable. Summer, of course, is especially painful.
What a fine line there is between artistry and insanity. There's no formula for it, and I think a lot of people when they're around you - even those closest to you - when you're in that whirl of creativity and you're grabbing those things out of the air, there's no rational process.