Depressed

I feel this intense sadness while I’m on suboxone. I’ve been on 4mg for a little over a month and I feel really disconnected and I have this lingering sadness. Like that feeling you have right before you cry. It just lingers in the back of my mind and I can almost feel it behind my eyes. It’s very strange and I’m just wondering if I should start tapering off now or if I should wait. I was taking fentanyl for quite awhile. Am I still going through withdrawals from that or do you think this is a result of suboxone. I’m very confused and I’m not sure what to do so I’m back here seeking advice.