We have an avid nurser here. DD nursed every 2 hours until around her 2nd birthday which was also when she finished getting in all of her teeth. Now she wakes about 1-2 times per night average to nurse.
night-weaned her a couple times, but the work involved was just too much, and we just kind of coasted along until she finally backed off a bit after the teeth came in. We are also still co-sleeping. DD can go for 8 hours in the day without nursing, but most days she still nurses every 2-4 hours. Depends if we're doing anything interesting that day.
If your DD is healthy, strong and growing, I wouldn't worry about the food. There are some mamas that don't even give solids until around a year. We started around 7 months but she didn't get much into food for a couple more months. Then she ate just about anything. And now we're into days where she doesn't eat much food at all, but nurses a lot, or maybe she won't eat much all day, then she'll pig out at night.
I hope you are able to get some sleep - or at least some naps! If I hadn't been able to take some naps, I don't know how I would've made it.
Can your DP stand in for you one night with some expressed breast milk? (My DD wouldn't even look at a bottle of EBM if I was in the house.) Or maybe your partner or a friend could watch your DD for an afternoon so you could at least get in a good 5 hour nap? My parents did this for me when they came to visit and I could hardly believe the difference it made.
Hang in there. I think there's a lot about this subject on these boards so I'm sure someone else may know of a link on here that discusses it further. Good luck! You are definitely not alone!