Feeling like a bad mom

So when my baby was born she had a problem with low blood sugar and wasn’t latching so they had to give her formula. I was okay with that because I wanted her to be okay. After her sugars were okay I kept trying to nurse with almost no luck. My nipples are flat so I tried 2 different brands of nipple shields per the LC at the hospital and baby still wasn’t having it. She would attach but would suck for a few minutes then scream. I then tried a pump to see if I could just mainly feed that way with no luck at all. At first nothing came out then one day I woke up and was leaking so I was so excited that my milk came in but still after pumping 30 mins I get maybe 1 oz total after doing both sides! My baby is almost 2 weeks old and I keep pumping every 2 hours to hopefully increase my supply but now when I do feed her the breast milk it upsets her stomach she cries and cries for the whole day after that breast milk bottle until she finally poops and is okay. I just am at a loss. And feel so depressed and like a failure as a mom. At this point I am exclusively formula feeding and her belly seems so much better less crying and less gas.