Something must be different, or it would not have stalled. Your response makes no sense. In order to determine what to do, I need to know what went wrong. Many questions:
Are there temperature swings? Did you let the sorrel mixture cool completely?
Wait, was your starting gravity 1.15? Are you reading your hydrometer correctly? This mead should never be 1.15.
What gravities did you add nutrients?
How did you measure the honey?
Was the Wyeast 1388 shipped during a heat wave?
Are you using Fermaid K?
In the meantime, degas the crap out of it by shaking multiple times a day. Also, place it on top of your refrigerator if your home is cold. If you can, take a pH reading.