DayZ admin here. Unfortunately with the extremely limited admin powers there is not a whole lot that we can do for you. You have a few options, but they involve waiting.
1. Go to r/dayz (Reddit) with your coordinates and ask to be killed.
2. Leave yourself online and go do something else and let your character starve to death.
3. Try rolling, Crawling, Crouching anything to get out.
I sincerely wish I could help you, but there just isn't anything we can do. You can also try logging into another server to see if when you are reloaded you are able to move.
I'm sorry DayZ has ruined your playing experience, but the game is in alpha afterall. Good luck!