My email doesn’t exist.

About one week ago, I think my email has been hacked. I found that out few days ago when I tried to access it, it told me that someone else might have been using my account. Because I can't log into it and I didn't add a phone number to the email, therefore I couldn't get the pin to reset it, so I answered a few questions, and they sent an email link to reset the password. It's all good until yesterday I tried to log into it again, it tells me my account doesn't exist. I even tried to create an account with my email address, but it tells me it's either reserved domain or it's taken...so I would like to know why is this happening. My email address is *** Email address is removed for privacy ***. Help would be appreciated.