I can’t believe I stopped

I’ve tried for 2 weeks to get my supply back up. I’m only 7.5 weeks pp but I don’t know what to do anymore. I went back to work a week ago and that doesn’t help. I’m barely getting 1/2 oz - 1 oz total by the end of each day. Im not pumping enough at work and I’m skipping pumping at night for my own sanity because I get up for work at 4 am. I’m so mad at myself for stopping at 2-3 weeks pp because I was so fatigued and wasn’t eating. I just want to be able to pump and give it to my little one but I don’t think my supply will every pick back up. Does anyone have advice for me to not keep beating myself up? I’m devastated and I feel like a failure.