the itch

I've got an itch
that I can't scratch.
I've got an itch
and pain to match.
I've got an itch
a burning fire.
I've got an itch
a bog, a mire.
A hidden door
without a latch;
an endless pit,
a crummy batch;
an item bought
that I regret;
a broken heart,
a rotten bet.
And it is somewhere
I can't get.
Can you get that for me?
Thanks.