I would look at the upgrade code and see what DB changes are made, then you can try to reverse those changes (manually). If you don't understand DB's and the coding you can ask for help (which you have been), if you need it ASAP, try asking in the paid forums.
You need to calm down and stop with the swearing though. Yes, your problem was caused by an issue in the upgrade, but it has been expanded by you not having a recent backup.
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