How to make twins fall asleep HELP!!

My twins are just two weeks old and I have been having a nightmare of a time getting them to sleep. The one was underweight and had to wake her every 2 hours the doctor made me which kind of messed up her schedule now it's every 3 like her brother. My husband works crazy hours and travels and its only me literally taking care of them I'm trying to stay awake during their feedings. I'm so exhausted I don't even know where to begin and I am so grouchy. I been giving them both two bottles it's helping more. I also use the white noise machine and use night voices. Please any advice will do wonderful anything ladies. Thanks so much. I just need any sleep.