Newborn either cries or sleeps!!

We had our newborn 5 weeks ago and she is either crying or sleeping. If she is up she is crying to be fed, once fed she is crying to en burped, once done she is crying again!! Sometimes we feel it’s growth spurts, sometimes we feel breast milk doesn’t make her full so we also tried giving her formula during the day (we usually formula feed in the night) but that also didn’t help. So literally either she is sleeping or she is crying.. any thoughts and ideas?