A.J.
I know your frustration...and yes it will get better. Hang in there.
Two of my breastfed babies slept through the night very early on so I think it really depends on he baby, not necessarily the food.
What immediately came to mind was 2 things...reflux and teething. My middle child had such severe reflux while I breastfed him that I had to stop. Formula, rice cereal, zantac and sleeping propped up all helped significantly.
As far as teething is concerned there are many things you can try and do; teething tablets, oragel, tykenol, wet washcloth etc. But really just patience is best.
Another thing to keep in mind is that developmentally there are things happening that could be a culprit. Yes separation anxiety is one of them and it usually occurs around this time. Also when infants learn a new skill, such a s standing, they tend to sleep less. But these stages shall pass.
What I did with my 1st during this time was I gave her a fischer price aqarium that was attached to her crib. I'd stay with her rubbing, reassuring & holding her hand until she fell asleep. Yes, even in the middle of the night. She was (and still is) a very high maintainence baby/child and CIO took a long time but eventually worked when she was not experiencing any of the above mentioned issues or sick.
Good luck and hang in there. It will get better, soon, I promise.