I was dueling some guy 1000tc and half way through the server crashed. It was all the TC I had and had earned through Judo Tourney. So is it gone forever or am I able to get it back?

You could ask the guy you were dueling with to send back TCs. I think there isn't another way.

Given how you have tourney winnings in transaction history, then no other entries, and your TC are gone, you might actually have luck trying to ask market squad for a refund due to a bug. Go to scam reports, read board rules etc etc. then make a thread and explain the situation as precisely as you can.