Don't run or drive the car!
Disconnect the battery completely overnight (maybe put it on the charger).
IMHO, it's never a good idea to charge a battery while it's hooked up to the car because if there's a fault in the charger, it can have nasty consequences. These things are becoming increasingly complex and you just can't take the chance.
Then replace the battery tomorrow and see if things have cleared up.
If not, take it to a dealer, the DME may be going faulty... hope not and maybe doing the battery trick will make everything better. Here's hoping anyway.
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