hi. so im normally an active person. i played flag football all through out high school and i played basketball non stop up until then. I am now a freshmen in college. I dont know when it all started but it was within 2012, but now if i walk up stairs my heart beats and i breath as if i just got done running. i am not big or fat or what you prefer to call it. it seems now if i were to do anything out of walking my heart beats really fast and i get winded. i have a little bit of breathing problems and find myself constantly needing something to drink. when my heart beats fast i can feel and hear it beat all the way up to my neck and i start to sweat. ive never had a sweating problem, but recently just walking non physical things make me sweat constantly. any suggestions on why this is? should i see a doctor?