Sick and taking care of a baby!!

I have been so sick but I'm feeling a lot better! Thursday I had to go to the ER because I couldn't even keep water down and couldn't stop getting sick. I was too weak to even hold my son!! After 8 hours in the ER and them running some tests, I have a GI bug and it caused an infection in my intestines. I was only supposed to eat bananas, rice, applesauce, toast and water... AKA "The BRAT diet" the doctor called it. Needless to say, that didn't last long so ate real food and of course every time I tried to do that, I got sick. And of course my son got sick and yesterday my boyfriend got sick. So here I am taking care of myself, the baby and my boyfriend!! I don't know how "super moms" do it. I'm exhausted and feel worse everyday because now I get constant headaches. Any advice on what to do?