About two weeks following my injury, I started having chronic tension type headache, along with some nausea.
(First 2 weeks I had more migraine like headache) Feeling a dull pressing pain around my forehead. No vomiting.

Past 3 month I'm having this about 4 days a week, even though it has recently subsided.

I did cat scan and everything was fine, and I dont really know whether this is common symptom or not, I need to know
So I can focus on recovery.
This headache aggravated by cognitive tasks.

Is the nausea headache a PCS symptom?

Gideon,

Why do you need to know so you can focus on recovery? I would think you would want to focus on recovery, no matter what.

Yes, a nausea headache is not uncommon. I had headaches on and off for 8 months from a very mild concussion about 8 years ago.

If you look for symptoms, you will find they appear to be more intense. If you focus on recovery and ignore your symptoms and try to move forward with your life, those symptoms will become less. Take a headache med, aspirin, acetaminophen, ibuprofen, or such to reduce the intensity and move on.

Headaches are often the last symptom to resolve. As I said, for me they can take many months. The nausea would be part of a migraine like headache or it can be because you focus on the headache and anxiety causes the nausea.