I get nosebleeds too!
Today I was in the bathroom at school and there was this girl was a girl with a nosebleed in there too. She was leaning her head back, which (after having many a nosebleed) I know you're not supposed to do. I wanted to tell her, but I don't know the German word for nosebleed! So instead, I said, 'Meine Arzt sagt nicht diese Weg (here I tilted my head back) aber diese Weg (here I tilted my head forward). Diese weg (here I tilted my head back) ist nicht so gut für deine (here I pointed to my stomach).' (This all roughly translates to, 'my doctor said not this way, but this way. This way is not so good for your...) So then she tilted her head forward! Who knew I'd ever be able to help people in German!