As a past sufferer of migraines myself, I sympathize with you very much. In my own chart I relate it to a conjunction of Uranus/Mercury in the chart. I personally believe that for the most part it has less to do with diet, unless there are severe allergies involved; this could relate to an autoimmune problem. Otherwise in my own experience it was all related to stress factors in my life, with the source being largely family issues [the conjunct falls in Cancer]. This could be the case here, with the opposition between 4th and 10th; one might suspect specific problems relating to siblings. Negative experiences from the past can also be involved. Saturn in Aries relates to the potential for restricted blood vessels in the head, which is typically the source of the problem. Neptune in Scorpio is a high stress factor, in dealing with significant emotional disturbances that can be overpowering. Neptune can also show vulnerability to toxins and poisons, and with the combination of energy in the 3rd H this can denote environmental toxins [sometimes siblings can also be highly toxic]. Neptune disorders are often difficult to diagnose and difficult to control.
The chart provided here is extremely limiting for a proper reading though, and perhaps the placement of Chiron also has something to do with. Alas, these types of headaches are extremely difficult to cure, they can only be controlled...at a higher level, I think this is a way that the body tries to block out the contents of the subconscious from rising to the surface...this is part of the mind/body connection associated with the Virgo energy. I hope you can find a way for dealing with these headaches, and often psychotherapy can be more effective than drugs. To reduce these headaches you have to learn about your own stress triggers and how to deflect them [cognitive therapy]. Some good news though, which I hope will be true for you, is that over time it seems that I 'grew out of that syndrome' fortunately, and I think this is true in a lot of cases. Best of luck to you in taming this dragon.