So be a brat. You didn't choose to be in this situation, BC is literally a train wreck for some of us; you limp away with missing body parts, poisoned, burnt and beaten up. Is it any surprise you don't feel on top of the world?
There is a big difference between relieved and being happy. Let's leave grateful out of it for the moment. Trying to maintain some semblance of grace and equanimity through the whole shit fight is exhausting and sometimes you wonder why you bother. Now is the time to have a tantrum if you have to; you've been holding yourself together for a long, long time. Drop that bundle and give it a good kicking.
Take to your bed, or refuse to get in it. Drive around crying in the car (good place for screaming) Do what ever you want to for the next little while--yeah, I know, you just want to be the old you, but you'll have to try something else for a bit. Things get better. Mxx