Lots of !
I don't have the time to read all the responses, so I apologize if I repeat or step on any toes.
With both DC, I went through very similar feelings and experiences!!!
With DC1, it finally turned around at 3mo, when I realized I had raging thrush that I'd developed from his lousy latch/tongue tie issues that we'd clipped at 5 weeks. Yes, 3 mo of trying everything, being stressed over every single feeding, etc. To that point, I was BFing every other feeding because that was all the pain I could stand and then FFing every other and pumping here and there too.
With DC2, he was losing weight and (in hindsight) had reflux. It was just a mess. (And the BBBers here were AWESOME.) Now, he's 9mo and the little booger will not take a bottle. Our BFing relationship soared in the 2nd mo, I'd guess.
With both, I just told myself over and over I had to take it one feeding at a time. Most feedings, I did want to try BF and working on the issues. But, others, I wanted to give the LO formula and take a BREAK. I know the purists are always worried about supply, and I respect that. But, I also think there is a time to give yourself a break and realize doing so is not going to sabotage the whole thing.
I also took fenugreek throughout those times just to help with supply for if/when things turned around. And I pumped when I could.
GL!
ETA: oops : I just realized this is a few weeks old and bumped for an update. My bad.