Do you still have a daily indulgence of gluten? I know since I gave up gluten, when I go out to a restaurant and if they somehow throw some form of gluten in a recipe it really affects me pretty badly. If you are still having a daily indulgence maybe you should remove it strictly if you don't want those symptoms to flare up again.
Aside from diet, are you sleeping well, getting enough vitamin D and getting enough exercise?
"If man made it, don't eat it" - Jack Lallane
People say I am on a "crazy" diet. What is so crazy about eating veggies, fruits, seafood and organ meats? Just because I don't eat whole wheat and processed food doesn't make my diet "crazy". Maybe everyone else with a SAD are the "crazy" ones for putting that junk in their system.