Toni, I am so sorry that Will is sick. Are they sure it is the flu? Although he could remain weak, etc. I find it difficult to believe he actually has a flu virus lasting one month. As far as the bronchitis goes I am not surprised because his immune system is so compromised. Usually antibiotics take 24-48 hours to START working. Vomiting is sometimes associated with all the mucus that has been swallowed and or drained into the stomach. It creates havoc and therefore we get nauseated and start vomiting. Vomiting is our body's way of getting rid of unwanted stomach contents and frequently people feel a little better after getting rid of all that mucus, plus as the vomit comes up it also pulls mucus out of the throat. The bile could be from several things. An excess amount of acid is produced when you have all that mucus to actually try to digest it. Thus you have bile when you vomit. That is just one explanation and believe me there are several. It's possible that the antibiotic is not working and he needs a different one, OR the antibiotic is making him vomit, There are several things it could be. He HAS to drink LOTS of fluids tho. He will get dehydrated quickly and get sicker if he doesn't. I would try to answer in more detail but I am not there to see what is going on so it is hard to answer intelligently. I hope by now that the Dr has called back and he/she has followed up on everything. Keep me posted.