I've been feeling really whiny too. As for trying to explain stuff, I usually come straight out with "I find it hard to explain" or "If you've never been there, you won't really understand what I'm saying". It sort of disarms the critics and is incredibly patronising which gives them a taste of their own medicine.

Some charities and organisations are working on cards to give to people when they don't understand mental illness. I can't remember where I read that but it sounds like a good idea.

You're not alone.