New mom struggles

I’m a first time mom to my 13 day old. I have always known and been told being a mom can be the toughest job. I never completely understood that until now. I am exhausted. I am having a lot of nipple and breast pains from breastfeeding. I’m constantly worried I’m not doing it right. I woke up with anxiety this morning because my husband is going back to work tomorrow. Will the breastfeeding pains go away? Any advice of when or how I can be more confident as I embark on this journey? Any tips?