My original yahoo account I suspect got erased or deleted somehow?

I had another account recently sense 2014 but I had to create this one as when I got home from work the other day for whatever reason I could not get back in. 

I was not even able to type the password screen as when I went in the sign in screen and typed in my screen name that I usually type in ALL THE TIME it said the email did not exist and as a result I was not able to type in a password even.

When I tried to use my phone number to see if it was under that it did not show up on that screen either.

I have had this email for YEARS.

I tried clicking to sign into it repeatedly and that made it come to a screen that said "uh Oh we cannot sign you in right now".

I have important stuff and other things I associated with this email and now for whatever dumb reason I cannot seem to get back into it.

Its like it disappeared from the face of the earth or something.  

Is there any way I can recover it or is it lost forever?

Some of the services I use with said email said to change the email to a different email unfortunately I had to access IT first and get confirmation there.

Is there any way at all I can get into my old account and/or have it restored somehow?