Sleep

I legitimately need help. My 6 week old baby sleeps a 2 hour stretch at night and then the rest of the night she does 45 mins or less. More frequently it's about 20-30 mins. She's been doing this since 2 weeks old. She's bottle fed with a combination of formula and breastmilk, swaddled, and laying with a slight incline in a next-to-the-bed sleeper. I'm beyond exhausted. Please, any other moms go through this? Did anything help? When will this change? I need a light at the end of the tunnel....