Coconut oil can certainly cause bad herxes, if you have candida overgrowth. Coconut oil contains several types of fatty acids that are deadly to Candida, including monolaurin, capric and caprylic acids, all are fungicidal. I think that may be what is causing your flares, most lyme patients have candida overgrowth.
Zinc is used in building T cells, which are an essential component of the immune system and obviously when u have a system infection your immune system needs to produce more T cells than usual. Another important chemical used by the immune system is Selenium. I don't have to tell you about
Vitamin C as an immune booster, you probably know that already.
You should detox more aggressively, take a look at this page
www.healingwell.com/community/default.aspx?f=30&m=1606610also
www.tiredoflyme.com/detox-methods.html