https://bitcointalk.org/index.php?topic=990345.0

That topic explains on how to sign a message, you don't need to submit your private key to anywhere.
Sign a message using the address that you used on your hacked account and then contact either cyrus or theymos for recovery.

Make sure to send the PM when they're online, it's more likely they will read your PMs that way.
Mods received hundreds of PMs everyday and the chance for them to miss your PMs is big.

Also, the only way to recover your account is via signed message with your address that you used on your hacked account as a proof.
Post you signed message so I along with others can verify that you indeed lost your account.

1. Not sure, I didn't log in for some months and when I came back my password and email has been changed.
2.Bitcointalk account are worth a ton if it's in high rank, in my case my ID is on Hero which can worth a ton and years to raise.
3.Just sign a message using an old address that you used on Bitcointalk, it should be enough to prove that you owned the account.

Months has passed and still no reply from any either Theymos or Cyrus.
Not sure what to do now.

Edit:
A new signed message just cause

-----BEGIN BITCOIN SIGNED MESSAGE-----
My account teddy5145 has been hacked/lost. The current date is 14th of November 2017.
Here is the link to my undedited post from which my signed address comes from:
https://bitcointalk.org/index.php?topic=1637672.msg17285093#msg17285093
-----BEGIN SIGNATURE-----
131mcmLZ7B1fSX3sGuwsUc4dJMwDqCrq8r
IPb7FCtC91HhZc1mWFzsLRXdbWH6e/5ykBDvBy8iEZ0jT5vOIQg1xpzTepvrt70VWgzz8GEt3V22aKz5k4IeiEw=
-----END BITCOIN SIGNED MESSAGE-----

A week has passed and still no reply from Theymos, I'll try to Contact Cyrus

Still no reply from Theymos so far
Should I PM him again or keep waiting?

I will wait, It's just a panic thing you know
In the meantime is it possible for you to tag the ID?

Oh gitu yah, ok deh makasi ya gan atas testimoninya
Mungkin ada member lain yg bisa ngasih testimoninya?
Ane masih ragu juga nih hehehe

Permisi kawan-kawan, mau nanya disini ada yg pernah menggunakan Triv.co.id untuk jual/beli btc?
Ane mau jual BTC via triv dikarenakan ratenya yg lebih tinggi jika dibandingkan dengan LocalBitcoin tapi masih ragu apakah ini terpercaya atau tidak

Yea, I was using an alphanumeric password and I don't know how my account got compromised, most likely through a phishing site that I didn't notice I've visited.
Anyway, I've contacted Theymos via PM hope he can sort this out

Thanks for verifying it though  

Long story short, it seems like my account was compromised without my knowing while I was gone as the account has made a few posts and even enrolled on a signature campaign. I tried to recover the account but it seems I can't as I haven't received any recovery email(Maybe the main email was changed?)
I can proof my identity by signing one of the old address that I posted months ago.
My last post are from 4th of January, the rest of the posts after that are not mine.

-----BEGIN BITCOIN SIGNED MESSAGE-----
This is the real owner of teddy5145 hereby declares that my account was compromised without my knowing and to proof that I'm the real owner I will sign this message using the address from one of my old post
https://bitcointalk.org/index.php?topic=1637672.msg17285093#msg17285093
-----BEGIN SIGNATURE-----
H/QyIgi9sqmw01dePuqi2fG5bfUVPUcUvok8o6szhUtsAUqPuWLBYwA5LpFgYmlyGi7Bjv42LNXtyJ4c1Z60YV4=
-----END BITCOIN SIGNED MESSAGE-----


Please tag the account for now