NOB,
No, it is not wrong for you to be bitter, angry and jealous. That is just being human! You have every right to be angry. I just lost my 29 year old daughter to tongue cancer in October. It is not fair and I am very angry and very disillusioned with the medical community in general. It is so hard to understand how we can give a person a new heart or send men into outer space, but we can't get a handle on curing cancer. It sure boggles my mind!
I know it's hard to do, but please try not to panic. The others are right. A neck dissection is relatively simple. Compared to what your sister has already gone through, it will probably be a piece of cake. Depending on how radical the surgery is and how good the surgeon is, there may be some problems with the muscles or nerves, but physical therapy can be a great help. And if it can save her life, it is worth it.
You can vent all your anger and frustration here as much and as often as you want. We are good at "listening", albeit with an electronic ear.
Rainbows & hugs,
Rosie