I sense you are in a panic. Take a deep breath and try to calm yourself. Cancer is scary, but the best way to deal with this is from as objective a place as possible. I've had almost the same experience as you in regard to diagnosis and surgeries. I have lost some slight movement of my arm but this is slowly getting better. The worst has been the swelling in that arm, some all the time but a great deal after a lot of excercise or work. But it has always gone down with rest. I did a pro and con comparison list in regard to changes this diagnosis has brought me. Things didn't look so bad when I saw it in print. I can't comment on the Interferon as I didn't choose that route. You will always have the fear of the cancer with you. Don't let the fear control you.
Cancer is like snowflakes. It is never exactly the same for any two people so don't grasp at something because it worked for one person because that is no guarantee it will work for all. Educate yourself on what is happening with research so you can ask your Dr questions and make informed decisions. View the snake oil salesmen with caution, there are no miracle cures but there are things you can do. First is to listen to your Drs but get a second opinion if you want. Find a good shrink. Someone totally outside your circle whom you can say anything too without fear. You'll be amazed at how ridiculous some of our fears sound when spoken aloud. It will help with your peace of mind. Avoid talking about your illness with friends and family. They're scared too and while well meaning may not be very helpful with their advice.
Eat properly. No fad diets or drastic changes. Drastic changes in diet can throw your body into a tailspin. Stop doing things you know for a fact are bad for you. Stop smoking, no sun without sunscreen or at all, drink in moderation, no unneccessary meds and make sure any homeopathics you take aren't going to interfere with the meds your Dr gave you.
Don't think of this as a death sentence. Its a bump in the road that we have to deal with.