13 years old, stabbing pains.. Ribs, head, chest, hurts when i breath

I am 13 years old female, i have been getting really bad sharp pains in my left side of rib, under arm wise and around the rib leading to my back, it hurts when i take a deep breath, and i faint sometimes for no reason. I get stabbing pains in chest heart area and in my head, i get butterfly's in my stomach for no reason, i worry about things really easily, i'm a tad bit over weight but nothing serious. This might seem a bit wierd but sometimes when i'm walking mostly once or twice a day i'm walking fairly slow, but it feels like i'm speeding, when i'm a sleep every night i wake up feeling like i have fell out of my bed, as people say its my heart stopping, my hair does fall out constantly but no bold patches but thinner, can u help ?