Well - you could be peri-menopausal .. you don't say how old you are, but my friends are I all finding ourselves irregular and some of us have very long cycles at this point. You may be anemic.
I don't get the staples part either. I had staples with my C-section. Is that what you are referring to? I don't know how that relates to have tubal ligation. Can you elaborate?
I've never personally known anyone who had a tubal ligation fail. I've never heard of anyone who knew of a person having it fail - so my personal feeling is the chances would be very small.
If it was me, I'd just go get a test - so you wouldn't have to worry. Then I'd go make an appointment to find out why I feel nauseous, tired, and why my cycle is delayed. I'd keep a log and take that in at my next appointment (keep track of when you ovulate, and go back a few months). Are you taking vitamins (I take a women's multi for my age group) and eating well? that sort of thing. Getting enough sleep? Etc.
Best to you