…the most off my stuff is gone. I brought many weapons and tool but all gone. What happens? I have a chance to get this all back?
Check your market logs and make a record of what you find, you’ll have to file a support request. If the items were removed from a hacker they normally will return the items to you as non-tradeables.
There’s a how to on filing a support ticket here:
It’s a mystery to everybody, but it seems that if your account is inactive for a year, someone “hacks” your account and your items get sold on the market. But if you contact support, there’s a good chance you’ll get your items back. Also, make sure to enable 2 Factor Authentification.
And also, NEVER use the same password for your email and for any game account.