I believe that I've been hacked and that someone is actively interferring with all of my communications and accounts. How can stop this?

1. Change all of your passwords to New unique passwords. Log out of all social network sites and sites like Amazon.com, etc. LOG OUT from all browsers after you change your passwords and are sure that the new passwords will let you log in. Run a cloud antivirus scan, like the free one from ESET, (if you run a scan from the cloud, you are more likely to find malware that may already have control of your computer.) There is a lot more you need to do, but the most important thing is to log out of all of your accounts after changing your passwords. Many apps or websites will show you where you are currently logged in from and let you log out from all these instances. Depending on what services you use for email, etc… there are different ways of getting your account back. Use a different device first of all to narrow down if your device is compromised, or if it is your information that has been stolen. You need to be much more specific however, to get the help you need.

I assume you are referring to your linux PC, not the DO account. Have you tried rootkit hunter? rkhunter

Redirection can be due to your router being hacked, i.e. DNS hacking.