I was offline for a couple of days, and when I came back, there is a hole in the side of my house, and all my crops to my garden are gone..
You're not supposed to get anything back, staff will undo whatever has been broken so if possible, don't fix your grief.
Even if it takes several days you should wait for a staff member to check your grief out. That way they can fix it for you , plus the griefer will be caught. If you fix your own grief that griefer can go free and continue to grief players. I know it is inconvenient but there normally is always some form of staff member on the AEM network who can put it in a group chat etc. -Can I also just recommend you try putting your co-ordinates in next time, that way staff can get to it and fix it even if you aren't online.