I need help, so sleep deprived its ridiculous

[QuietNinjaTardis]

Dd is up every 2 hours, sometimes I can shush her back. To sleep for a short while but if she wakes the quickest way to get her back to sleep is bf her. I am on my knees with exhaustion as I am an insomniac so by the time I've got back to sleep she's awake again. Sometimes I'm awake the whole time between feeds like last night as she's so noisy in her sleep I'm constantly on edge that she'll wake up again.
Please don't suggest co sleeping as I will not sleep at all that way can barely stand Dh in bed with me
How can I stretch her feeds out a bit more?
Before her 12 week growth spurt she was doing a good 5/6/sometimes7 hour stretch before the first feed and then a 4/5 hour stretch but since then she's every 2 hours and I can barely focus I'm so tired. I've got a 4 year old as well so cannot catch up in the day plus dd is a rubbish napper.
Wtf can I do? I don't want to give formula but I'm seriously thinking about it. Oh and I can't express, can't seem to get anything. I have no idea if she would take a bottle anyway. There's nothing I can do is there? I'm stuck aren't I?

[QuietNinjaTardis]

I know formula might help her sleep longer cos she won't need feeding s much but bf going so well this time I really want to keep on ebf. Maybe ill change ,y mind after another week or two or no sleep!