Whenever im stressed or something doesn't go right , i will freek out cry, and then bang my head on things or bite myself why? some nights ill fall asleep crying for no reason, and then wake up happy untill something else happens. but its almost a pshycot

This : This is not a normal reaction to stress. You should be evaluated by a mental health professional right away. You could be dealing with a psychiatric disorder. If you ever feel like hurting yourself or anyone else go to the emergency room or call 911. Please seek help soon.

Overly reactive.: I would recommend an evaluation by a clinical psychologist or a psychiatrist. It sounds you emotions are poorly regulated.