Hello and thanks for trusting me to help you. I am a board certified consultant with over 30 years of experience.
I understand your concern.
Well after 5 days, your risk of any serious brain injury is very minimal.
Serious brain injury would generally make itself known over the first 24 hours. Serious bleeding which would cause problems would certainly have caused symptoms (worsening headache, dizziness, lethargy, confusion, vomiting, numbness, weakness, etc) within hours.
Mild headaches are completely normal after hitting your head. Ensuring that they don't worsen is important.
Most likely your soreness to touch and headache gradually improve over the time in next few days.
You should maintain a good hydration.
You can continue Paracetamol.
And cool compresses on affected area.
If you are feeling fine (other than a mild headache) without any other neurologic symptoms - there really is no reason for a CT scan at this point.
If your symptoms'll not improve in next few days then see your doctor on Monday.
Let me know if you have any further query so we can discuss it thoroughly in every aspect.
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