What's going on with my body? I'm scared? Please help!?

sounds like a panic attack. google it and read up on symptoms and ways to calm down from them. if this is scaring you and happening often, see a doctor asap. panic attacks are common and can come on even if you've never had them before or if you feel like you can handle the stress (because maybe subconsciously, you can't). but im no dr, so get checked out if its scaring you.