say what ever you feel comfortable. With that many people maybe there is one that you are really comfortable, ask her to lunch to share.
You have been thru so much this past year and are still going thru tough times.
This may not be the best time to go out with these friends.
I don't think I would announce to the group your problems, you could just say that you have been having a tough time of things and that you don't really feel comfortable talking about them.
They should respect you for that. And they may have lots to say, change the subject back to them.
bizi