Oh Kaz.

I understand the pain and frustration from sudden nipple damage after so long! My DD waited until 2 years of age before causing me dreadful nipple damage. Watch his attachment carefully and pay attention if he's coming to the end of a feed particularly. Try a different hold (a lot easier said than done once they're bigger, but it may take the pressure off the sore area), or like Kmn suggested, lying down might work.

All of the nipple care stuff from the early days advice might come in useful too!

Try the ABA helpline too - 1800 mum 2 mum.