Puss lump on breast

My breast has been sore the past couple of days and I just noticed this lump on my breast and it had a head on it so I squeezed it and this thick green puss came out with blood. There’s still a large lump but I can’t get more puss out. What should I do? I’ve had sepsis before and I’m worried cause there’s blood in it that I will get it again. Also my son has been vomiting more than usual and crying all today and yesterday and his belly is off. Has anyone had anything similar? Worried it’s also gotten into my milk and that’s why he’s like this 😭😭