Hello there, welcome to HCM
Let me tell you something regarding Traumatic
Brain Injury at first-- Its either by direct/indirect impacts due to which there are injury at the site of the skull where it got hit and inside where the brain matters got hit with the skull, resulting in a lot of symptoms like headache, soreness over the affected area,
redness ,
dizziness, dec vision/hearing/fits ,
loss of consciousness etc.
As for your case, the swelling should get setteled down in another few hours (just keep the ice pack on -your doing just fine) while the bruise (depending on its size,area and intensity of the force of injury) should get resolved in a few days (generally takes ~ 7-14 days)
Meanwhile if you experience Mild Headache/Pain just take Tab.
PARACETAMOL 650mg three times a day(8 hrs apart) after some food for 2-3 days
Right now there's no need to concern but if you experience any worsening of symptoms and appearance of any of those alarming features stated above , check in to your nearest ER at the earliest
Once again thanks a lot contacting HCM and let me know later on how you stay