Sounds like you are dealing with some serious issues. I'm not an expert on the subject, but found some information that might be helpful.
Research has demonstrated larch and other arabinogalactans to be capable of enhancing the immune response to bacterial infection via stimulation of phagocytosis, competitive binding of bacterial fimbriae, or bacterial opsonization. This was found to be particularly true for infection by gram negative organisms such as Escherichia coli and Klebsiella species. It is even used in pediatric care and generally regarded as safe.
Plenty of fluids would be my recommendation and take a day or two off when you experience symptoms. Please seek Medical Advice, headaches and fever are not commonly reported when taking LA.