I had a very similiar situation, except my daughter would be up all night. I gave up Milk, Soy, and nuts. I was also an exclusive pumper that supplmented. We don’t have a ton of milk so I just eliminated soy milk, and lattes (it was awful)!! I was able to eat dairy cooked, and so was my daughter, so pancakes, cookies, etc. were fin My daughter is now at 21 months starting to eat cheese. Just try it, but I will say when I changed my diet it was like she was a completely different baby. It was very much worth it.
Also check with your health insurance they may cover the specialty formula. Ours did it was great but we did Nutramigen…. apparently it tastes better?