In my teenage years I suddenly started to have two or three really big nose bleeds every day. I went to the doctor and he found that I'd acquired an infection in my nasal tissue. He prescribed a cream to rub up my nose and, within days, the problem was fixed.
So my first point is that the sudden onset of nosebleeds doesn't necessarily mean that you're seriously ill!
Equally I'm not trying to rule out the possibility of environmental factors, within your house, contributing to your problem. But I am suggesting that getting your GP to shine his otoscope up your nose ought to be the first thing that you need to do.
Chris