Headaches on Doxy and off Doxy are normal. What are you de-toxing with?
I didn't know enough to detox when I was on Doxy almost 2 years ago and I was sure I was dying and wouldn't make it to the end of the year.
It's a very crucial part of getting through these treatments, and seriously something we can/should still do a little of after we've healed.
Consider ammonia build up or possible Lymph nodes clogged.
What are you doing to help your body rid it'self of toxins?
www.tiredoflyme.com/detox-methods.html