Hey Carol, this has happened to me. I also lost my "MORE" tab on the new timeline and have been waiting for FB to fix that issue for about 2 weeks now. That's where the Notes are, or used to be.
Just to make sure you've checked; When you go to your HOME page, then look on the left panel, you will see a list of Pages, Apps, Groups, etc.
Hover your mouse over the GROUPS word and move about an inch directly to your right and the word MORE will pop up. Click that and a new page opens with all your groups on it. There you will have the option to edit or remove your groups.
If you've done that and still don't see your groups, then I'm at a loss.
FYI: Don't get too used to this new style. I hear FB is getting ready to launch yet another change. Hooray! (insert sarcasm here).