There's not much to do, really.
About your file-host account:
I'm sure, if you send an email to their support, they will recover your account. They normally do, unless they have some stupid TOS against this. Something like that they will ignore your e-mails if you are mailing them about hacked accounts, etc. It's silly. But I don't think Filesonic has such a stupid rule.
You can try to recover your email by contacting the provider. Just give them a call, both hotmail and google. I assume that you have verified gmail with your original phone number. If you've done that, it shouldn't be any problems recovering your account.
About your hosting account;
Again, do not hestitate to contact your provider. They should do everything to help you. Let us know if you're ignored, because if you're ignored, other people should be aware of whom is hosting you, so they can avoid them in the future.
You should'nt use your same password on every website, application/software, etc. It's not safe at all. You've experienced this now, and i'm sure you don't want to experience this a second time. If there's still some accounts you can process to, you should definately change the password and email ASAP to avoid losing more accounts.
Use a password generator for all your passwords. Save them into a password manager, or just do as I do; save them in notepad.
Something else you should be aware of is that you shouldn't download from unreliable sources. Do not run applications that is not downloaded from the original website, that means, you should'nt donwload warez. Warez is the main reason for you being hacked. Or you've been on some cracking forum and downloaded a bunch of crackers which is backdoored. You have to be more careful. Buy legit copies of softwares, just to avoid losing your accounts or the worst scenario: Losing all your money.