my 3 year old son has been complaining of headaches, more frequently than 3-4 times a week. For the last 6-8 weeks or so, he has been having frequent nosebleeds. Probably around 2-3 times a week. Then, of course, he says, my tummy hurt a few times a week. The nosebleeds have happened in different locations, home, daycare, restaurants, outside, etc. So I am kind of ruling out dry air . Should I be concerned?