dd is tearing my nipple to shreds

[moanyhole]

im in agony,
its not really biting- she (91/2 months) decides to de-latch and literally clamps down on my nipple, pulls and drags the nipple along her two bottom teeth, it is toecurlingly painful, and my nipple is in shreds and bleeding on the underside. i cant bear to feed again on that side because it just cant take any more trauma. i cant pre empt this happening because one second she's sucking the next she pulls. tonight im not sure what to do- i tried expressing and hit the roof nearly with pain and ended up with an ounce of blood, i tried using a nipple shield but she was having none of it.

help please! if i dont feed from the left side will i lose supply/ get mastitis- she's still a frequent feeder.
xx

thanks girls,
i fed her there from the right and she was rooting for the left- there isnt enough in one boob to keep her satisfied for long so id say ill be up quite a bit! ill see if i can brave a feed from the left in the morning. she's been doing this at the end of a feed, i think its probably teething.