Healing Crisis vs Herx:
A healing crisis occurs when one gets treatment for a health condition and experiences a brief period of worstening symptoms before symptoms improve. A herx could be said to be a specific type of healing crisis related exclusively to the release of toxins from dying spirochetes (e.g., Lyme).
More info on methylation and genomics:
http://www.heartfixer.com/AMRI-Nutrigenomics.htm
http://aboutmecfs.org.violet.arvixe.com/RsRch/GSHMethylation.aspx
To get tested, the least expensive test I know of is from here:
http://www.holisticheal.com/health-tests/nutrigenomic-testing/comprehensive-methylation-panel-with-methylation-pathway-analysis.html
Take care,