Sick Friend,
Don't say I'm sorry unless you have done something that you are responsible for.
I hope you feel better is more positive.
You can ask your friend if there is anything I can do for you.
This opens the door for them to tell you what they want/need.
This is your way of offering a sympathatic response.
If you ever read my bio it only tells one short period of my life.
I would tell you don't feel sorry for me I am not looking for sympathy I've heard it so many times it makes me feel awkward slightly freakish.
I tell my story because I want to share it. It helps me get it out of me and if by sharing my experiences helps one person feel that they are not alone, then all of my suffering has some positvity.