already want to give up

Kaila
I really don't think I have ppd but this is the only spot this post fit in. My son is just over two weeks old and I'm already just so tired. He was so good in the beginning. The last couple days he's been up really fussy trying to just keep eating. I've been struggling with breastfeeding and I think he has a problem with the formula I was using. Now today he hasn't eaten as much as usual and has been asleep literally all day. Took me hours to get him to sleep this morning and now he doesn't want to stay awake. He has a doctors appointment in the morning to see if the formula is an issue but I just get so upset not knowing why he's upset. I feel bad not breastfeeding exclusively. I just don't think I was or am committed enough. 
My SO works everyday and when he comes home isn't much help. There's not a lot he can do when my son just wants to sleep and I'm trying to breastfeed anyways, it's just really hard when I'm doing it alone all day and then he comes home and i still feel alone. I feel like I'm failing already. I cry so much. Idk what to do to prevent this from turning into a full depression.