Could be either one, or a mix of both, depending on the strength of your immune system (and probably other factors I'm not thinking of right now).
Herxing means die-off of bacteria (good), but it also means clogged/overloaded detox pathways (not so good).
I've read here and on other chronic illness forums that exercising to tolerance is better than trying to force onesself to stick to a set plan no matter what. So maybe throw in some detox baths, etc. and see what happens?
Chronic Lyme Disease, Chronic Bartonella (clinical dx only), Gluten & Sulfite Sensitivity, Many Food/Inhalant/Medication/Chemical Allergies & Intolerances, Asthma, Gut issues (dysmotility, non-specific inflammation), UCTD ("Secondary Lupus-Like Syndrome"), Osteoporosis, chronic Lymphopenia, etc.; G-Tube; Currently weaning off TPN.
Meds: Pulmicort, IV Doxycycline, Heparin (to flush PICC line), Claritin, Singulair, Domperidone, Colloidal Silver (topically & nasally), probiotics, Liver support herbs, Ailanthus, digestive enzymes, homeopathy.