Hi,
You do seem sick of it, and it is a painful thing to deal with. However, 3 times seems more like bad luck than anything else. After all, most people can expect 3 colds over winter. I don't believe there is a type of woman that is "prone" to mastitis", in most cases it's a management thing. it is important to try to identify the reasons you get mastitis and then you can work on prevention. Importantly I would say, don't let your breasts become overly full and engorged. I was wondering, how often do you feed your baby in 24 hours? Do you tend to schedule feeds? Or feed on demand? How is your health overall? Often when you get the first signs of mastitis you can relieve them by feeding your baby (emptying the breast) and putting an icepack on the affected area to reduce swelling. You could take some neurofen as well. You shouldn't expect that this will keep happening