Accidental removal of Apple id
RRecently I moved my supplier from Virgin to sky & as a result had to change my email address. Whilst trying to update my iPad I stupidly removed my Apple ID and updated with a new one. For a while everything appeared to be working then I noticed that when I called upitunes or apps store etc it kept asking for my old Apple id and password. My iPad will no longer allow me access to iTunes, I store apps icloud etc. Everything else appears to be working ( mail eg). HELP PLEASE!!!
iPad, iOS 7.1.2