Can't remember rach - have you been tested for Celiac Disease? If so, how long ago was it? If you are on steroids, you may get a negative result even if you have it. You may want to try a gluten-free diet, if you aren't already on one. CD is quite common, and many researchers think that gluten sensitivity is even more common than CD.

Here's a link, if you're interested in more information:
http://neurotalk.psychcentral.com/post8767-2.html
Hope this helps!