Try allowing her to really really finish the first boob before giving her the next one. I'm wondering if she has got stronger and sucks harder and is almost frightening herself with the squirts!
If you can try and relax physically yourself you will also find it easier.

How often is she feeding? And 1 side or 2 each feed? And is she gaining weight and weeing happily?
Is your nipple still round after each feed, or is it a strange shape??

I think you should pick a quiet time for you and call the ABA helpline on 1800 mum2mum and have a chat to an expert - I don't actually think you have a major problem, but some reassurance and suggestions on how to improve matters wouldn't go astray,