When it feels that big, leave home.
Leave it all!
Breathe deeply. All the way in and then all the way out. Even if the freezing air burns your nose and chest, get it in there.
Shake your arms and legs about and get the blood back into them.
Notice the tiny things. The oddly shaped things, the magical things, the new season things.
Hold hands and trust.
You'll be so glad you/I did.