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One of the safest oils for a breastfeeding mother to use is lavender (Lavandula angustifolia). Other oils that may be considered are geranium (Pelargonium graveolens), Roman chamomile (Chamaemelum nobile), and fennel (Foeniculum vulgare var. dulce).
Zinc is considered compatible with breastfeeding, particularly in small amounts (excessive amounts are not a good idea, for mom's sake rather than baby's). In addition, nasal sprays/gels are generally a better choice for nursing moms as compared to oral medicines.