Thanks! Yes, I have access to that address. I read achow101's thread but I don't know that much about Bitcoin and english isn't my first language so I'm a little confused about what I should do.
Also I tried the accelerator but it seems like I was to slow this time. :/ Will try again later.
I can't advise you how to make a child pays for parent transaction in core because I don't have enough experience.
An alternative you might try is contacting either quickseller or macbook-air, and asking them if they will confirm your transaction for a fee.
They both have access to f2pool, which confirm your transaction.
You can contact them by clicking these links. However, they are probably overloaded with requests to confirm transactions, so might not reply.
https://bitcointalk.org/index.php?action=pm;sa=send;u=358020https://bitcointalk.org/index.php?action=pm;sa=send;u=16114They charged 0.0001 BTC per transaction last year, but probably want a lot more now.
I faced a similar issue a few days back transaction not getting confirmed due to low fee but user "QuickSeller" got my transaction confirmed in minutes when I sent him 0.0001 BTC. He has access to some pool . PM him.