I used to get freaked out at "relapses" when I first started medication so know that's not uncommon and normal to be concerned but like someone said, it isn't medication poop out.
We all will at times for various reasons, have anxiety here & there. If we didn't, we wouldnt be normal
The key to recovery for me, and I'm still a work in progress, is how I react to it when it does arise. By continuing to practice coping skills (I see a psychotherapist, use mantras, pray, etc), you will learn to quell the anxiety at its early stages.
Ps: I can almost guarantee your candy binge, (I can only assume you raided your kids bags lol), was a huge contributor to your anxiety/depressed feeling. I can't do sugar anymore like I used to. That's not a bad thing but I do love sweets. I have to watch them now bc they will make me feel physically bad, even sugar rushes, & that will set off anxiety. It's not worth it. I've a friend who just made the connection that her depression is almost non-existent when she doesn't eat sugar!
Wishing you well.