Had had: Como utilizar?

If I’d had the opportunities that you had I wouldn’t have done what you did
(Se eu tivesse tido as oportunidades que você teve, eu não teria feito o que você fez)

If I had had the opportunities that you had I wouldn't have done what you did.
(Se eu tivesse tido as oportunidades que você teve, eu não teria feito o que você fez)

outro exemplo:

He had had nothing to do last night, so he just spent his time messing around the tv.

He did had nothing...

Qual a diferença entre I'd had e had had? He'd had e He had had.?