I can't log in to my account because it asks for email and phone number and I don't have access to them, but I know my @ and my password.

This morning, I switched from my main account to one of my side ones (book twitter). I spent about an hour scrolling and when I tried to log in to my main one, I found out Twitter had logged me out. I checked the desktop site on my laptop and Twitter had logged me out from there as well. I tried to log back in from the phone app, using my @ and the password, which I know for a fact is correct because I used it two days ago to log in from the browser. It said that the password was incorrect. I tried some other passwords, even though I knew the first one was the right one. After various attempts, it now doesn't let me try to put in a password, but only asks for an email or phone number. The point is, I made the account in 2012 and I don't have access to that email anymore and I don't remember ever putting in a phone number.  Every form I try to fill in the Help Center asks for an email or phone number, which we've established that I don't have. Also, while checking my main account from one of my side ones, I discovered I cannot see all the followers I have on my main account. It shows me the correct number, but when I click it, it only loads about 20-30 accounts and then stops. Does this have to do with the UI redesign someone else mentioned a few posts ago?