Yeah, I knew I was going to wean but not THIS suddenly!

For the past month or so, LO's been nursing 3x a day: wakeup, bedtime, middle of the night feeding. But, for the last 5 nights she's slept through her night feeding, dropping her nursing down to 2x/day. Then, for the last 3 feedings (tonight, this morning, and last night), she would be nursing and then suddenly pull off the boob and start crying! She would latch on again, suck once or twice and then start crying again until I switched boobs.

At tonight's feeding, she sucked for less than 10 seconds before having her crying fit and I wondered if I seriously was dried up so I tried to express some milk and OMG, nothing.

I really think that my milk supply has dried up and now I'm not sure what I'm supposed to do? Worried, I had the hubs make a 2oz. bottle of formula and she actually drank it all - and she hasn't TOUCHED a bottle since she was 3 months old.

1) When weaned from the boob, am I supposed now just give her a bottle?
2) Is it possible to avoid a bottle at all?
3) I'm not prepared for this at all - I have no idea what I'm supposed to do!