HELLO to all

I need your help and experience, community...

I've been mining dgb for some time,and carefully storing it in my wallet for the entire period.

I initially created two addresses for each of my miners.

 Everything was fine until recently when I updated the current wallet available.

At launch only one address appeared, I thought it was due to a synch problem.
but once fully synchronized, even so I only find one of my two addresses available.

 I have only the wallet.dat, unfortunately I didn't save the private keys of each address.

 What can I do? Do I have a possible recourse?

 It is also impossible for me via the latest version of the wallet to create a new receiving address.

 thank you all for your time and help