NeuroTalk Support Groups - Question about bumpy car rides

Hello , Im 17 year old male who is worried about a 4 day bumpy car ride.

For my past incidents: I have had a concussion 5 years ago after getting strangled and falling head first into cement after losing consciousness. I had slurred speech for a couple of months and there was a huge bump on my left cheek where i fell. Im not quite sure what the bump is, but my unqualified assumption is that its a ruptured cheek tendon/muscle or something like that. Its very visually unnoticeable now, but you can still feel it. I also played soccer for multiple hours a day everyday when i was 7 to 13, and there was an emphasis on doing headers in my soccer club.

About the car ride itself, i took a car ride for 4 days on dirt road. I think the total time i spend going through the road was around 18 hours, and I slept for 3 hours of it. The distance of the trip was around 310 miles. The road was notoriously bad and I could feel my head moving around every 10 seconds. I often came close to hitting my head on the ceiling from the impact and my head felt like shattering by the end of it. I dont know anything about cars, but I think the car I drove in was a mercedez benz g500, if the suspension is important.

The symptoms from this are frequent sharp headaches, neck pain, stiff neck, and a general feeling of something being off. I read somewhere here that a car bump can only generate about 1.5G of acceleration and that it doesnt even register as a subconcussive strike. So Im sorta leaning on the fact that maybe the symptoms are coming from a neck injury, or maybe even just anxiety. I do have a very stiff neck right now. This car ride definitely wouldn't cause brain damage right? ... or at least not permanent brain damage?