I get so angry and sensitive over almost everything after I got dumped, is this supposed to happen
Yes, because you're emotions: angry, sad, frustruated have to do with your spliting up
yes, because you feel rejected, but it will get better, only with time. Been there!
Its normal for girls and boys. Hormones act up easily during puberty so thats another thing. It happens to everyone I'm sure, it happens to me. ;)
Is it possible you were the same way just less intense before the breakup?
Your emotions are all over the place. This will get better with time