Formula VS Breast Milk

Hi friends! Does anyone have any experience with going from a mix of breast milk and formula to strictly formula?

I’ve been EP for almost four weeks and I think I want to be done. I get those excessive feelings of dread, and it’s amplified at night. It’s tanking my mental health and I just… I’m to the point I want to throw in the towel. I wanted so bad to breastfeed but he can’t keep a latch. So EP has been the only way to get him breast milk.

The biggest things for me are 1.) breastmilk contains antibodies if our house gets sick, it would make baby boys sickness easier to handle/ hopefully less intense. 2.) I do feel it’s better for their gut biome to have breast milk I just don’t know HOW much better. If there is a major difference or if it’s just slight.

Any advice here?