Suggest Treatment For Headache After Collar Bone Fracture

I broke my collar bone just over two years ago and have had headaches ever since it healed and i was off pain meds. what could be the problem I am 32 years old 5' 11 " and weigh 185. Severe mva at time of injury. knocked out for 30 min mri to brain neg/mri to neck neg/ broken femur three places/ rod and pins to fix/ all ribs on right broken/