Sour breastmilk

So I think I have discovered I might have a problem with excess lipase in my breastmilk. have stored weeks worth of breastmilk and now my baby refuses it when I thaw it to feed her a bottle. She even projectile vomited the other day after drinking some. I noticed it smells sour and she gags when I try to give it to her. I'm wondering if anyone else has this problem and has had any luck with scalding and freezing? I have heard that corrects the problem but then I wonder if it's worth it because it takes away some of the nutrients. Feel at a loss.