Feeling worse each day pp

I am almost 6 days pp with my 3rd baby. With each day that passes, I feel worse and worse physically. My back is so sore that I can’t stand for more than 20 minutes. My vagina is as sore as when I was 9 months pregnant—I can hardly lift my leg to get into the car. My core is so weak I literally cannot sit up in bed without using my hands. I truly just feel like something is wrong specifically with my core. I suspect I have Diastasis Recti. Obviously I’ll bring this up at my pp appointment but just curious if anyone else has experienced this. Also, I understand I just had a baby and it’s normal to be sore but this is so different from my previous postpartum experiences. Usually you feel better as you recover but I’m just feeling worse.