Urgent Help My Gmail Got Hacked

[BHWAccount]

Today, 8-9 hour ago my gmail got hacked, Hacker added their mobile number as 2FA.
So, When i try to login a code is sending to their number.

I don't understand how the hacker got access to my gmail and added their number, As i have already added:

1. My Own Number
2. 2FA code from 2fa.zone
3. Recovery Email Added and Verified.

I didn't get any single notification on my mobile, or recovery email address.

Hacker maybe can't change the password yet, Just added their 2fa number.

When i try to recover, its asking to send code to hacker number.
So, Its seems impossible for me to recover.

I can't find any help, I need urgent help from expert, As it is very important for me.
I need to account recover.

Please help me.

Thanks

[BHWAccount]

There is high chance, My account got hacked by onehack.us owner, The last activity i did is login onehack.us using my gmail.
After 3-4hr my account got hacked.

Also, I noticed seller added 2FA code to paywithmoon.com account, Where i have recently deposited money.

Please help me to recover my gmail.

[BHWAccount]

Anyone Can help me?