This may sound overly simplistic, but have you tried increasing your magnesium intake. I sufferred from migraine and cluster migraines fir over 8 years on a near daily basis until I read about high dose magnesium healing nerve endings. It worked like a miracle for me. After 2 weeks the intensity of pain decreased and at 4 weeks I was having less headaches, finally they quit with only infrequent pain with westher changes or extreme stress.
Best wishes to you.