hello, exactly a week ago i dove off my friends (low) diving board. i usually do it very well, however this time i believe my lower body flopped when i hit the water and it felt like someone punched me in the back... it still hurts, feels numb when i sit down, and hurts very bad when i try to correct my posture, lean forward or back... please help, i need to know if it is serious or not (age: 16, height: 5'7'', weight:117)