I hit the back part of my head on the bottom of a truck bed earlier today around 1100 my head hurts now. i worry about subderal hematoma ?

Sub dural hematoma: it takes significant forece to casue it. not sure how bad your injury was. see a doctor if concerns. A subdural haematoma is a collection of clotting blood that forms in the subdural space. This is the space between two of the meninges, which form the protective lining that covers the brain. Can t be diagnosed on virtual health. http://patient.info/health/subdural-haematoma-leaflet

Possibly: You don't tell us symptoms that we might suspect with a subdural. However since you're having persistent pain you should go ahead and see your physician

Local pain and even a diffuse headache would be expected following closed-head trauma. Since this was recent, impossible to predict the outcome over the next day or two. Low chance of subdural bleeding at age 27. If headache intensity increases, you feel dizzy and off balance, you develop blurring or doubling of vision, nausea and vomiting occur, time to head to ER.