I hit my head pretty hard on a concrete wall about a month ago. Now, I have more frequent headaches, flashbacks, and have had a few dp episodes. I also have a line-shaped dent in the area that was hit and it sometimes hurts, though not badly. I've looked online and this sound somewhat like a skull fracture, but I'm not sure. Can anyone help me figure out what's wrong with me and what to do about it?

Only a doctor can help to diagnose and treat you.

The Internet is a great tool my friend, but no substitute for a REAL LIVE IN PERSON TRAINED DOCTOR examining you. Especially for something so serious that may require TREATMENT sooner rather than later, and seems to get worse.

Do yourself a favor and see a doctor or at least go to an emergency room. IMMEDIATELY!

"Can anyone help me figure out what's wrong with me and what to do about it?"

A doctor could have told you weeks ago.