Stop googling!! Don't do it again! You'll make yourself crazy.
A thick lining can be caused by lots of things and from your history of long stretches without bleeding I'd bet that it's probably just lots of buildup. My sis had something simliar a few years ago and a simple d&c got her all straightened out. When I was going through infertility I even had times when my lining would be thicker than usual and my doc said that over time, it can actually cause adhesions that will attach to your ovaries etc...which I did have and had an exploratory lap to remove. So..it can be any number of things...just don't google anymore okay?
