I might also add that I didn't realise that always being in a negative mood, having no drive to proceed with life, having no ambition, not sleeping well, etc seem like the characteristic "early 20s" mood that most people "go through"… I didn't recognise until after I became healthy what healthy really feels like.

Now I run 15-20 miles per week, I'm 30Kg lighter than when I had allergies, and since my diagnosis I've had the drive to found my own agency business and (almost) get a SAAS platform out of the door.