Sounds like Bell's Palsy, which is a known symptom of Lyme. Glad you are seeing your Lyme doc soon. Vitamin B12 may or may not help...clinical studies suggest B12 can help Bell's Palsy, but I don't know how effective B12 is specifically for Lyme-related Bell's Palsy.
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 trying to wean off TPN.
Meds: Pulmicort, IV Ceftazidime, Heparin (to flush PICC line), Claritin, Domperidone, Colloidal Silver (used topically), probiotics, Milk Thistle, Ailanthus, homeopathy.