So sorry my friend - and yes, this is where the withdrawal kicks in when your body has search everywhere for more of the drug. You have traces left in fat reserves which will still be absorbed into the system a fair few days after you stop completely, so its not something to worry about. You had a bit of a "honeymoon" period and just when you think you're on it... BAM!
Same thing happened years ago when I told my doctor I wanted to come off my Citalopram and he told me to halve the dose that week, then half again on the second week and then stop after two weeks.
I was fine for just over a week and I felt the worst I have ever known. It was after this that I needed to think for myself and I have never looked back. But you will see the other side of this. You have done so well until this point. Just a bit of a rollercoaster now for a bit I'd expect
IUN