K.H.
Hi J.,
I feel for you. At night I would only feed my daughter formula(I breastfed all day long). Have you tried to up her formula to 6 oz? It took about 3 months for our daughter to sleep more than 2 hours at a time. If you feel comfortable sleeping with the baby and feel you will not roll on her, it might be easier on you to nurse her that way. We moved our daughter into our bed and she will nurse during the night as needed and I don't have to wake fully to feed her. Hang in there!!!! You'll get through this!!
~K.