And when do I give up?

My son is sick. On July 1st he developed a fever and was just lethargic. Next day we took him to the doctors and he tells me he has an ear infection which I honestly don't believe. Now a day later there is a MRSA bump on his side. I don't know what to do or think or say anymore I just want to give up already. I am not sure what else I can do about it that I haven't already done. I really need some help.