You need to do more research on the laws of your state, figure out what kind of patients are legally prescribed to it out there and if you are applicable. Figure out what doctor is allowed to prescribe medicinal marijuana in this state and act mature and stress that you don't want pills, you want herbal remedy.

With it just being headaches, it would have to be 9.5/10+ on the pain scale for you to receive this type of treatment, and even with that they probably still won't let you. Google your state laws, it's as simple as typing it in.

Go with an Indica dominant plant mixed with a hint of sativa for headaches and good luck!