Tips for sleeping ? FTM

My little girl is 3 weeks old and she gets up every two hours to eat then it takes her about an hour to fall back asleep. My husband works third shift 11-7 and he sleeps during the day so I’m basically taking care of her by myself and I am so exhausted. Does anyone have any tips on how to make her sleep for a little longer or help on what I should do during the night when I am so exhausted I almost fall asleep feeding her and I’m alone so I’m scared so most of the time I end up staying awake. Its really taking a toll on me I feel sick and my back and feet hurt I just need some advice from other moms on how to make things easier for me :(