Yes, it does sound like a flare. Also, this often happens when tapering Prednisone. Sometimes, when tapering, patients have found that they've had to increase their dosage again to get the symptoms under control. Then, they either continue tapering or remain on a low maintenance dose.
Make sure that you let your doctor know about these symptoms that sound exactly like a flare-up. The two of you may need to make some adjustments in order to get the symptoms under control.
I hope that you start to feel better very soon.
Peace and Blessings
Look For The Good and Praise It!