It should get better
It is quite common for migraines to worsen after a concussion
(or even begin for the first time).
The good news is almost all symptoms from a concussion, including the increase in migraines, will dissipate over a period of 6-12 weeks, which is the typical time frame it takes any injured tissue to heal (the brain included). Nine out of ten folks are symptom free 3 months after a concussion.