depression symptoms after going back down to 10mg

Hey all, at the beginning of December I decided to up my dosage to 20mg from 10mg. Huge mistake on my part, the side effects were horrendous. So about 10 days ago I tapered back down to 10mg, which I’ve been on for 2 years. I’ve noticed I’m still emotionally blunted and rather depressed. Just wondering if this is a common symptom from going back down to 10mg and how long this will last. The 10mg was working just fine but I get really anxious and depressed every year around this time so that’s the reason I went up. Is my brain just adjusting to the chemical changes or what? I’ve also been on Wellbutrin for almost a week. It helps a little but I still don’t feel like my usual self.