Dealing with guilt over formula feeding. How can I get over it?

You tried so hard, and for reasons BEYOND YOUR CONTROL(that is key), it didn't work out. Please don't be so hard on yourself, sweetie. There are so many other ways you can bond with and take care of your baby, and he certainly won't remember how he was fed the first year of his life. I can relate, though. With my daughter, I nursed really well for 2 months, and then she developed GERD and nursing became too hard on both of us. I felt so sad, like I wasn't doing all I could. With my son, I nursed for 3 months, and it was great. Then suddenly my milk slowed down, and he refused to nurse, which decreased it even more. He was too hungry for what I could give him. I tried pumping after every feeding, fenugreek, warm compresses, everything. Nothing worked. I felt really sad, but not as sad as I was with my daughter. I guess I was more prepared for it not working out since I had already been through it with her. It was worse with him in a way because this time it was MY problem. He was a great nurser. He is 8 months now, and I've gotte over the sadness. We both adjusted to bottles well, and he has thrived. He's 22 lbs! I actually found that it was easier to make eye contact with bottlefeeding, and it has other benefits too. I can bottle feed anywhere, whereas with nursing I'd have to go hide. Bottle feeding takes less time, and I always know how much he gets. You just need to look on the bright side, and realize that you're a great mom, no matter how you feed your baby.