@SarahGen-- I've used douches before, and they can be very effective. Aside from douches, you can try applying yogurt externally, taking probiotic supplements, eating garlic and applying coconut oil externally.
Yogurt and probiotics have good bacteria which can help re-balance your vaginal flora. Probiotics also strengthen the immune system. Garlic and coconut oil have anti-fungal properties and provide relief from yeast infection naturally.
Also, try to avoid sugar and carbohydrates because yeast thrives on them.