I feel for you, I really do. I lost 0.15btc by sending it to the wrong address once, I was devastated and extremely annoyed at myself. But the fault was mine and I've always been slow and cautious when making transactions in the future.
I can't imagine losing 7Btc and all because of someone else's malicious act. That'd make me mad as hell.
Keep your head up, your posts on steemit are getting good traction and spike my interest throughout the day, hopefully they can earn you back a fraction of what was lost.