There is something weird going on with my Stack Overflow account.
Last week I logged out of my Stack Overflow account and then logged in again. When I logged in, it opened another account with another user nickname and reputation, which I had created about two years ago. I removed my Gmail login from that new account and tried to login again with my Gmail account. It asked me to choose a nickname, I entered my nickname and my first account was recovered. But now I cannot login to that account from another computer or another browser. I am trying to add new login; I open Edit profile&Settings, but it shows me an error page saying
Oops! Something Bad Happened!
I tried to merge two accounts, filled out the merge form, but again "Oops! Something Bad Happened!" appeared. What can I do about that? The account I want to recover is https://stackoverflow.com/users/2102416/bigo.