I am an 18 year old girl. I hit my head 4 years ago. Basically I was changing and got stuck and fell from standing and hit my head in the wall really hard. After I fell by maybe 15, 20 seconds. My whole body shook really bad. I had a big bump on the back of my head and a headache for a week. But I didn’t go to the hospital. And now 4 years later I get regular headaches where I hit my head and I can’t sleep on it like I get a headache whenever I lay on the back of my head. Since last year I’ve had a constant stiff neck and it won’t go away. Is this bad should I go get it checked out?