Send negative trust to your old account "This was my account and it was hacked (date)"
See what you can do to get some DT to leave a negative on the hacked account, figure out what evidence you can muster and what evidence they will accept to place a negative.
Continue with your new account and start over. Start your company related OPs over again, warn in your old ones, and maybe you can get a mod to lock them.

I wouldn't hold out hope for recovering your old account. I'll give you a merit to help get you started fresh.
Take more proactive measures to not get hacked again. Stake a f'n address.