Looks like you were on a fork. So you didn't loose anything, you were just mining on your own chain.
What's going on with the sync? I lost 20k and about 7k immature transactions!!! Is there any way to recover my coins? What about block explorer? How can I check my blocks?
Oh really? Damn my luck... (First time hurts!)
Is it possible to check on block explorer by address and not only by block?