One thing is certain, Meebs, you are not alone out there! It's the current state of the world.
First up: Stuff the jobs, they weren't for you.
Second: Explain to your dentist, they'll work something out.
Third: Get into some charity work, it'll keep you busy until you get something permamnent.
I have to jump through hoops to get over my depression. You just need a good friend to talk to. Someone you trust. If all comes to nothing do you have the equivelent of the Samaritans in Germany. It'll mean you can sound off about your problems and they may have the answer.
Don't let the world today get you down. It'll change. Write a bit of fanfic, it'll make you feel good.
Just a meerkat from The Effing Forest