I am 15 and today at school we were doing cross country. I had my purple seritide 125 inhaler with me as I knew I would need it. I had to take it a considerable amount of times as I was extremely breathless and tight chested. Shortly after taking it quite a few times, I started to feel headachy, weak, shaky, dizzy and I had jelly legs. I'm just worried that I've given myself a bad overdose. What should I do??? Please help!!