Baby blues...

I'm 4 days pp. I labored for 16 hours and they told me I needed to have a csection due to the birth canal not being big enough. I'm sore and limited to what I can do, which I feel like has alot to do with it. It makes me feel like I can't be the best mom. I just want to feel better, but I don't want to rush my leave from work. I feel super alone as my husband stays in the man cave alot. Someone please tell me this feelings goes away. I also feel bad that I'm so sad when I'm so happy to have a beautiful healthy baby.