I would choose the B vitamins over the prescript
ion any day, personally. They are safer, and a deficiency of B12 and/or of Folic Acid can cause permanent nerve damage if the deficiency is not corrected. Most MD's here in the US won't treat a mild B12 deficiency, when in fact the deficiency may be worse than they think - our normal range for B12 here is still considered deficient in Japan, for example.
I also wouldn't bother with the lumbar puncture - tests for Lyme on CSF fluid are typically very inaccurate according to what I have read. And what stage you are at does not affect treatment. If your symptoms and labs aren't enough to get them to treat you, then it might be time for a second opinion...
Chronic Lyme Disease, Gluten & Sulfite Sensitivity, Many Food/Inhalant/Medication/Chemical Allergies & Intolerances, Asthma, Gut issues (dysmotility, non-specific inflammation), UCTD ("Secondary Lupus-Like Syndrome"), Osteoporosis, Pancytopenia, chronic malabsorption/malnutrition, etc.; G-Tube; Currently TPN-dependent.
Meds: Zofran, Pulmicort, Heparin (to flush PICC line), Claritin, Colloidal Silver (used topically), IV Milk Thistle, probiotics.