En voulant changer le nom de l'administrateur principal de mon Mac Book Pro, toutes les données ont disparu. Comment les récupérer ?

Bonjour!
Je possède un Mac Book Pro 13" depuis avril 2013.
J'ai voulu changer le nom de l'administrateur principal de mon Mac. Pour cela je suis allée dans Préférences Système puis dans Utilisateurs et groupes puis j'ai fait clic droit sur le mon nom dans la colonne de gauche pour aller dans les Options avancées et j'ai modifié le nom de l'utilisateur principal. Mais alors le nom d'accès à mes fichiers a changé mais je pensais que je pourrais garder tous mes anciens fichiers.
En voulant appliquer les réglages, j'ai du redémarrer l'ordinateur qui s'est alors allumé comme nouvel ordinateur et j'ai tout perdu ! Toutes mes applications, le Pack Office, mes photos, mes fichiers, TOUT!
Cependant, quand je vais dans "A propos de ce mac" puis dans "Stockage" il me dit que j'ai toujours mes 200 Go utilisés ce qui me rassure car je pense que tout est caché quelque part mais pas définitivement effacé!
Comment dois-je faire pour tout récupérer ? ou au moins le maximum...! Ce qui me préoccupe le plus ce sont mes fichiers dont j'ai vraiment besoin!
Est-ce qu'il faudrait que je refasse la même manip' mais en mettant mon ancien nom pour que tout revienne comme avant ? J'ai un peur d'essayé et que je découvre que tout a été effacé cette fois-ci...
En attendant des solutions... Merci!

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