Breastfed baby

Kayla

My baby will be a month old this Sunday and he will literally cry unless I am nursing him... I have tried giving him gripe water, gas drops, burping him even MORE and NOTHING. it just started this week too, I tried switching to formula thinking it was just my breast milk and NOTHING, I even took him to the doctor yesterday and they said he is perfectly healthy. I don’t know what to do. I don’t know if there is something actually wrong with him or if this is some sort of phase he is going through where he just wants to be attached to me 24/7 but he literally won’t even go to sleep unless I am nursing him.