Giving up on breastfeeding

I feel horrible. My entire pregnancy I wanted nothing more than to breastfeed my baby. But I didn't count on the severe ppd I developed after giving birth. Unable to handle the stress and pain of struggling to get my son to attach to my flat, bloody nipples every hour for 45 minutes each around the clock, I finally gave in on the third day and gave him formula and bought a $150 doubke electric breast pump the next day. And ever since, I haven't been able to pump more than 2oz in one sitting. I pump about 6-7 times a day for 30 minutes, which is as much as I can handle with my ppd, work and baby. I get 2oz in the morning and every other time I pump after, I'm lucky to get even 1oz from both breasts combined. I'm feeling as if me and my body simply weren't meant to be a mommy. I feel so sad but I'm thinking it's time to stop pumping. It's a huge dissapointment each and every time my body fails myself and my baby. At best I can provide just one and a half meals a day for him. Any other mom go through anything like this? How'd you get through it, and get over feeling like a failure?