Has my minecraft account been hacked?

Okay so, Ive been really busy lastely so havent been on for about 2 weeks, and I go on today to find that my account (I used my e-mail to log on) has been changed. The account name has been changed (It got changed 7 days ago) to 'MiniguPvP'. I searched it on a name checker and it was previously my original name!
Also, the skin has been changed, im so confused. I searched the name into youtube and it came up with the person using that name, same skin and everything! I can get on it with my password but i dont understand what happened, help:')

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