Oh man, this coin is killing me.

I'll spare you my launch mining woes for now. What's really concerning me is the fact that when I open my wallet, which was syncing last night, the wallet is Out Of Sync, with no visible signs of attempting to connect and, worse still, the three addresses I had on there, one of which being my pool donation address, are now missing. How does this happen? Is address visibility contingent on network connectivity? Surely not? Can I assume that these addresses and any coins that might have been sent to them are gone now since I don't have the associated private keys, presumably.

If this is the wrong venue for this question, I'd appreciate a pointer in the right direction.

Thanks.