I need your help!!
I suffered a concussion (according to my doctor) when I hit my head against the ceiling of my basement.
I don't know whether I had a concussion or not. I did not loose consciousness and I didn't feel lightheaded.
I started feeling weird about 4 hours later while eating dinner. The weird feeling went away after 5 minutes. (I was feeling lightheaded, like I was going to pass out, but no nausea etc)
The next morning I had a slight headache but felt good otherwise. No memory loss no light sensitivity, etc.

After exactly a week I started feeling really dizzy. I felt like the world was spinning. the dizziness lasted for about a week and after that no headache, no dizziness, nothing.

Another week later I started feeling dizzy again but it was not like the week before. Just a weird feeling in my head (I don't know how to explain it

Now about 4 months later I am still experiencing these symptoms:
Dizziness, slight headache from time to time, neck pain

All of my symptoms get better when I standup and walk around, talk to my friends/ family, or play soccer or basketball.

My question is is it possible that I am suffering from pcs or should I get my neck checked out??
Thank you in advance for any help

Your symptoms are consistent with PCS; the fact that there was no loss of consciousness doesn't mean anything, many if not most concussions don't cause loss of consciousness.

Consider a visit with a physiatrist (often listed under physical medicine & rehabilitation) that works with TBI patients. They could also advise on your neck issues.

First of all thanks for your answer!

I am just confused because I always thought that symptoms would get worse while exercising?

Every TBI is different. If you want to exercise start slow and monitor for increase in symptoms. This is a good question for a physiatrist.