Today I did pacers at school. During it i get this blood taste in my mouth but it isn't blood but that's normal to me, that has happened to me since 6th grade my 1st year of middle school when a do a lot of running. But today i got this feeling a needle poking in my throat. And i kept on coughing and if i coughed to hard i thought i would throw up. But i didn't. This happened to my yesterday too but it was smaller and i didn't feel sick. Should i be concerned?