MY Best gear vanished!

Hi, as of an hour or so ago, I was item level 248 on my blackmage. I qued up with some guildies for an expert roll. When we entered the instance, I noticed I had no chest piece one, nor gloves. Easy fix right? I re clicked on the black mage armor set up. Still nothing, so i searched all of my inventory and only found some junk. I'm really not sure of what to do at this point, and being that all of my gear set items are hidden (so this kind of thing won't happen) I'm fairly sure I glitched or got hacked. I went from being a level 248 blackmage to level 228 and lost almost a weeks of progress. I'm hoping someone will be able to assist me here, as it's the weekend, and extra frustrating that my ability to enter high end dungeons and raids vanished at such a prime time. Thanks.