Need some advice

Baby girl is 5 days old today. I've been having issues breast feeding her since day one. They would try to help me in the hospital but she would never stay latched and it just led to her screaming and me in tears. She lost 10% weight and they had me start pumping and syringe feeding her. The most I ever got out of the pump was 7ml. After leaving the hospital I tried different positions at home. I had success kneeling in front of the glider and leaning over her. The longest she latched for then was about 20 minutes on the left breast. She had a check up yesterday to check her weight and she was down 11%. She also only had one pee diaper a day. They're trying to push formula on me but I'm now trying to exclusively pump for her. I pump every 2 hours and get between 1 - 2 oz. each time. Most of it comes from the right breast. She sleeps all day and is near impossible to wake to eat but I do feed her after every pump. So far today she has had 2 poops and 3 pees so that's been encouraging. I find my nipples to be pretty sore from pumping and I think I need a smaller shield? It's pulling in a bit of areola and they're looking kind of pink. My medela has also started making a whistle sound and I don't know what that's about. Does anyone have any advice for me? Should I be producing more by now or is it normal for day 5? The doctor made me feel like like an awful mother and a failure. I need some support.