It could be caused by the room - especially if it is a dark, cold room - which breeds dampness - in both the physical sense and also within your body.
Realize that Antibiotics aren't all that causes candida in your body. Eating a diet of foods that breed dampness inside of you will cause it, and relatively easily too.
My thought would be to eat more warming foods and spices. This means amaranth, quinoa, millet, aduki beans, mung beans, turmeric, coriander, etc. If you eat these consistently, you will kill candida. It can't live in a dry environment, which is what you're creating in your body when you eat warming foods.