I feel for everyone. It must be horrible having assets taken, overdraft charges incurred, etc.
However, it's not Apple that's raiding your bank account, but Paypal!
The big advice around the web is to *never* link a bank account to Paypal, but only a credit card. That way, your money can never be taken, and if there were a problem, you'd have the quite effective credit card block payment ability and dispute process--and could never be out more than $50. (Do not link Paypal to a debit card, either, as that is real money that is immediately taken from your account.)
If you need to link to Paypal for selling (e.g.,, on eBay), do that with an account that is separate from your regular bank account; indeed, set it up in a different bank entirely. That will protect your main accounts. You can do that as a separate Paypal account from the Paypal one you use for buying things.
As soon as this arose, PayPal should have stopped its multiple charges, or provided immediate refunds. Paypal has some 'xplainin' to do!
Given that the glitch appears to being iTunes, then Apple has some fixin' to do-- and should cover documented overdraft charges.