crying baby .

My baby girl who just turned  1 month old today does nothing but cry . She cries on & off throughout the whole day. I can't even get a break . I brought her to the doctors because I felt it was gas bothering her . They checked her stomach and she seemed fine .No hardness or anything . I thought Then maybe it can be consitpation . She usually poops once or twice a day . Yesterday she didn't poop at all but when she does it's not hard  . So the doctors aren't concerned . I'm so over whelmed . My one year old never did what my newborn does . I've tried Gripe water and little rememdies . Nothing has helped . I think it's stomach discomfort but I don't know if it's that or she's just crying to cry . She cries worse in the car . I can't even leave the house because she's so fussy . I'm literally a walking Zombie . I DONT KNOW WHAT TO DO !! Or if this is normal .