one thing you could try that i noticed you had not tried, fasting, I did a 36 hour dry fast (not my first one, but the first one since i had a head injury), during my 36 hour fast the headaches were rough, but after the 36 hours i felt really good the best i had felt in 10 months, and I do believe it did help me more then i thought it would.

fasting is one of the the best ways to heal the body, dont dismiss this idea but look up the benefits of fasting or feel free to ask me questions about it