Melatonin tea includes other ingredients which may have caused your reaction. Sleepytime melatonin tea includes: Chamomile, catnip, spearmint leaf, lemongrass leaf, hawthorn berry and only 1mg Melatonin. Any of those ingredients could be a problem for some people. I take 1-2mg tablet of melatonin each night to replace the melatonin robbed from me by a blood pressure medication. I have no problem with it, but would not try the tea with all those other ingredients. As you say, some things affect some of us more than others.