Joined a guild, got hacked.

So I joined a guild it was a level 6 guild so it was hard to resists this random invite. I then logged for the night, just about 20mins ago I went to log in but it said my password was wrong, I thought I was typing it in wrong so I typed it in again and again. Until finally I changed it, checked my old main to see all of my money was gone and I was used as a farmer. The server I joined the guild on was Mal'Ganis.