For several years, my son, now nine, has suffered from frequent sore throats (every two to three weeks), accompanied by general malaise and a high temperature. Each lasts up to five days. How can we prevent them?

They could be due to an allergy or a recurring low-grade virus. Either way, your son's immune system is compromised, and problems with the throat area can indicate emotional stress. It may be that rest, immune-boosting nutrients (vitamin C, zinc, echinacea and a multivitamin and mineral) and attention to diet (sugar is a potent immune suppressant) will break the cycle. Flower essences are a powerful but gentle way to help physical and emotional symptoms in children. Clare Harvey of the Hale Clinic in London recommends Allergy Mix and Cold/Flu Mix (which has snapdragon for sore throats and fevers) from the Petite Fleur Essences range, 01428 741572, flower@atlas.co.uk.

I have toenail fungus and understand the treatment is difficult and lengthy. Are there alternative treatments?

Usually, if there is a fungal infection of the nails, there is also one in the digestive tract. Look in your local health-food shop for books on candida. Following an anti-candida diet will improve your general health and help get rid of the fungus. The herb pau d'arco is an immune stimulant and effective antifungal, and can be taken internally (3x500mg twice daily). For external treatment, Manuka paint contains New Zealand tea tree oil and the antifungal herbs thyme and horopito; apply 1-2 drops twice a day (from kiwiherb.com). Other antifungal agents are Citricidal, tea tree oil, neem oil, aloe vera gel and calendula ointment. You may need to experiment with various remedies and it will take a few months to shift the fungus for good.

· Emma Mitchell is a natural health therapist. Before following Emma's recommendations, you should consult your GP about any medical problems or special health conditions.

Send your questions to Wellbeing, Guardian Weekend, 119 Farringdon Road, London EC1R 3ER. Email: ask.emma@theguardian.com.