Why is bishop rook pin so dangerous?

It's of course obvious, that I can't expect anything good from it, but what is main problem in it, that I can't take pawn, and should defend instead?
Also , do You think I ve survived due luck or something else?I don't have feeling it was luck only, there wasn't obvious moves to press Me to mate for opponent maybe

12...Bxh2 loses a vital tempo and a vital pawn h6.
You have to defend against Bxh6.

@tpr said ^

12...Bxh2 loses a vital tempo and a vital pawn h6.
You have to defend against Bxh6.

yeah I know, it creates much inconvinience

Partly it's a cognitive problem -- a mental lapse by us, the player. We are accustomed to thinking of the rook as a powerful piece. When in an absolute pin, as against the king, the rook carries no threat. But our calculating minds have a hard time adjusting to that status change. It disrupts our thinking.
Take home point: Create that pin if you can; prevent it if you can. Be aware of its heavy weight

@sparowe14 said ^

Partly it's a cognitive problem -- a mental lapse by us, the player. We are accustomed to thinking of the rook as a powerful piece. When in an absolute pin, as against the king, the rook carries no threat. But our calculating minds have a hard time adjusting to that status change. It disrupts our thinking.
Take home point: Create that pin if you can; prevent it if you can. Be aware of its he...

True, Thx for Advice!