Type 1 Headaches and hypos

Hi all, just wondering if anyone has had same problem with children and hypos. I know headaches can be caused by bg's being too high or low, but my son has throughout the year had periods of getting a bad headache followed by rapidly dropping bg's, usually resulting in a hypo about an hour from onset of headache. Today it happened again and when he got to 4.2 I gave him 3 gluco tabs which took him to 6.4 but then he keeps falling to about 4. Whilst I know these numbers are good, if he doesn't eat or take glucose at these lower bg's he hypos. It always happens when he gets these headaches, any ideas anyone?

Thanks peeps, I don't think it's his basal rates as if he has any less he is high all day. Maybe his morning bolus, I shall try lowering it. Keeping everything crossed x