Before we dig deeper Bittrex are
scam shady exchanges (
https://bitcointalk.org/index.php?action=trust;u=96390).
You are the only one who knows why you are being hacked, try to scan your PC from virus, malware, and etc. Also, What kinds of program that you use your API keys? does it open source or some closed-sourced trading bot scam. Try to remember step by step before your coin get lost.
After all, there is likely zero chance you could win back your coins.
I have access to the account only from my IP. API-keys without the right to withdraw funds. If I had been hacked, they would have changed the API -keys. But this was not. Dropped by the old keys. With keys without the right of withdrawal, you can only sell coins.
