Should this still be occuring 5 months (almost 6) after a car accident? Headaches, dizziness, nausea?

Yes I did hit my head and get a mild concussion, I hit my upper right forehead on the dashboard.. I was knocked unconcious and yes they did do a MRI/CT Scan on my head and said it was normal. I still suffer pain in the area and feel sensitive to noise when I have headaches and feel dizzy.. It feels like theres a bump in my head at times, like ingrown? But I feel sick to my stomach whenever I feel dizzy and this but I burp in cases which I'd prob puke (I used to randomly be sick and had my appendix removed and than I stopped. I don't know if these two are related.) But either way for a month and a half right after the accident these side affects were very pronounced and soon went away (or so I thought) now I get random bouts of this. I've been having this feeling so far for the past 5 hours today :/