Question about 51% attack

Has there been a 51% attack? Many exchanges blocked deposits and withdrawals, but the aeternity was still on the blockchain. Now all the ae that I’ve mined for the past two weeks is gone.

This is a fairly significant loss to me, since i cloud mined aeternity, and may have lost a big portion of my investment.

The blockchain explorer shows the transactions, but it says that the balance is 0. My wallet agrees.


My Wallet also shows zero.