For about 2 weeks or so my baby has been so fussy. Well I gave her formula twice last night since my…

For about 2 weeks or so my baby has been so fussy. Well I gave her formula twice last night since my supply has been low and she was so content after. So now I know my breast milk has been making her fussy but I have not changed my diet at all and she just began to be fussy 2 weeks ago. I really only want her on breast milk So what can I eat that would be helpful so my baby won't be as fussy no more?