Feeling Like a Failure

My daughter is 2 months old, and since day 1 has been an efficient drinker. Last month I started pumping and giving her expressed milk 3 times a day or so. Usually it's when we are on an outing or overnight. I've always been able to pump about 6-8 ounces in total each pumping session. And my daughter would feed 15-25 minutes on each breast during those sessions. On Saturday I had a massive milk oversupply and I was incredibly engorged on my left breast. Now, for the past 24 hours, I have not been able to express more than 1 ounce from each breast. And my daughter is getting incredibly fussy at the breast. Pulling and tugging the nipple away. After not being able to feed her from either breast or bottle, I broke and gave her a bottle of formula. My thought process was that I would be able to feed her a full feeding and within that time allow my breast to relax and fill so I can express as I was doing. But now I feel like a failure and that I totally screwed up my chances at continuing to breastfeed. Any advice or thoughts?