Hi and welcome to HCM!
Thanks for posting your query here.
Headache could be because of stenosis of meatal openings of the sinuses
into the nose. This cause a blockage in draining of the secretions from the sinuses which will result in headache. And also you need to check whether the bones has reset properly or not. Did you check it on an x-ray? If the alignment of bones is not proper it will cause a severe pain
. Analgesics can be used to relieve the pain.
I advise you to take an x-ray of the nasal bones which will show the alignment and healing and the problem can be further managed.
Hope this is helpful to you.