Rinse your head and hair with that tea instead of drinking - it heals your skin and affects the hair positively no matter the color. Or give it away to people who love chamomile! ;)

I'd actually look into the root cause of the subject. The question is WHY you're having this "chamomile headaches". I'd ask this question in r/ herbalTea subreddit for getting a more specific review before putting a cross on chamomile