Have you recently turned on your central heating? If so, that would dry out the atmosphere, and be enough to dry out the nasal secretions. Try putting some bowls of water on or near your radiators to create a bit of humidity, or get a humidifier or try steam inhalations. As for the blood, sorry to be crude, but do you tend to pick at the hardened secretions? That might be enough to break some of the tiny blood vessels in the nose and cause some bleeding. But, I'm no doctor, so if you're worried or it doesn't get better, you'd best go to your own GP.