only you know what you have bought and sold on Ebay,  if you have spent that money, than no you have not being hacked.   If you havent spent that money, than yes possibly you have being hacked.

Also has your partner, kids, grandmother or cat being spending??

If you think you have been hacked, have you reported it to your bank and eBay?

Not much use posting on a member to member forum, we can't do anything about it

As mentioned, are you sure it's not the fees you owe for selling?

You sold 3 items. It's probably the fees for selling those items. Someone else will have a better idea though, and hopefully should be along shortly.