I went through the same thing a couple of times with Mackenzie. I think the first time was around that age, and she resisted again about a month later (though not as strongly). I still don't know why it happened. It wasn't fun, but we did get through it. I only pumped and gave bottles for a couple of days until we sorted it out. Some things I did to get her to stop screaming and eat:
- Hold her facing away from me
- Sing and be silly
- Bounce her (this is what ended up working)
- Walk with her
- Make sure ebm is plenty warm, not just room temp
- Let her start on the boob and give her the bottle after a couple min (this did NOT make her happy)
We'd try all kinds of combinations of the above for a few min, and if she wasn't having it, we'd take a break and try again. She did end up going 6 hrs between feeds (during the day!) on the first day before giving in, but she did give in!
It's tough, but stick it out...she WILL get through it with some persistence and patience on your part!