fussy infant

ni

my daughter is 4 weeks . she has been fussy. not all day but i know she's not hungry because ill give her a bottle she'll drink some but will continue to cry while the bottle is in her mouth. I'll change her. ill hold her and rock her . sometimes ill put her on my chest and she still be fussy . she threw up this morning . but it seems like every time i burp her she tries to cough up more throw up but it doesn't come out . she has hiccups every feeding . her body is hot but her rectal temp is 99.2 she has white stuff on the roof of her mouth but idk if its oral thrush or just left over milk. she's on my chest right now i just felt her body its cooling off. sometimes i hear her trying to poop she cries from that sometimes so maybe an upset stomach . what can i do for an upset. stomach? from poop . stick the thermometer in her and see if that relieve anything