Fussy baby?

I’m a new mom to my very first baby girl. She’s only a few days old and was born November 11. She’s so fussy and constantly crying almost 24/7. It’s either I breastfeed her or she will cry like crazy so my husband basixally has to be her personal machine snoo to calm and put her to sleep! I’m so frustrated and nervous something else is going on. Plus her weight was initially 7 lbs and 1 oz and now her weight has gone down to 7.7%. I’ve been constantly feeding her colostrum as much as I could esp since she’s constantly crying. I’m still at the hospital cuz I’m worried about her constant crying and now her weight could go below 10% tonight. Is this normal for her to be fussy? She cries so violently and hard to sooth.