[jimworcs]

As usual, an airline employee responds with complete empathy. Reassuring to know how empathetic they are. However, I would take issue with one issue. It can be frustrating and get you very angry when you have been so badly treated, and when you complain, you end up throwing the kitchen sink at them. I would beware of this hazard, as it can be used to discredit you. In particular, to say that

Firstly, you have given us a serious viral infection which we caught on the way from Sydney to LA on flight UA 840 on the 13 December 2007

is a mistake. How did UA do this? Did they deliberately put other people on the plane with an infection? The circulation of the air is a standard function of the airplane design, and I can't see how you can blame and airline for this. What alternative action would you expect them to have done to protect you?
The rest of your complaint is completely justified, but I would avoid adding frivilous ones because they will discredit you. UA handled this badly and you should get some redress.