Flu in 3yr old, and maybe bronchitis help me deal?

My son has been sick since Friday. High temp off and on up to 102. He is coughing so hard he vomits sometimes. I am doing the Tylenol, and Ibuprofen and OTC cold remedies. Also we took him to the dr today and she said his lungs were "gunky" and gave us Zithromax for the lungs. She said he may have the flu too. I am about to lose my mind. He is irritable, whiney, crying off and on. He won't take a nap and needs it. What do you others do to help calm a sick child? Medicaly I am doing all I can. How do you handle all the crying, and irritability? I should know since this is my 3rd boy. My others are 13, and 7, but maybe I just forgot. Maybe just a I understand. I just am at my wits end. He hardly eats, I am forcing liquids and even at that it is minimal just enough for a wet diaper.