It sounds pretty classic for the Wyeast sweet mead yeast. I think you have a stuck fermentation. I would suggest a different yeast like Lalvin K1V-1116 or Lalvin EC-1118 to re-start this but that will take you dry which means you will need to stabilize with Camden and potassium sorbate to allow you to add more honey to taste when the fermentation has stopped and cleared.
If not keen on back sweetening then you can try re-pitching more sweet mead yeast but will need to make a nice starter first.
Question? Do you have any DAP/yeast nutrients/yeast energizer? I'll provide some instructions on if you can use the commercial stuff or if it is not easily available.
First Smack the Smack pack as the instructions give and wait the full 2 hours.
In the mean time prepare the starter must.
2 cups warm water
1/4 cup honey or sugar (Honey prefered since it lowers PH a bit)
1/4 tsp of yeast nutrients
10 fine chopped raisins
Mix all that together and pitch the yeast into it after the first two hours, cover with paper towel and rubber band & wait one hour. You should see it foaming up. Next add in 1/2 cup of your must from the 5 gallon batch & wait 2 hours. Fermentation should not look like it is stopping. repeat that step 3 more times so you have just over 4 cups of total volume. After all that pitch the yeast along with 2 tsp of yeast energizer. It may take 24 - 48 hours to take off strong but that should get your yeast going.
If you do not have access to the yeast nutrient/energizer then the following can be used.
Befor making the starter take your 2 cups of water and mix in 1TBS of bread yeast. Boil that mix for 30 minutes. The resulting mix will have plenty of amino acids and proteins for the yeast to munch on as nutrients. Just take that liquid and mix in water to bring back to 2 cups and let cool to a warm room temp. The rest of the starter goes as normal just without the yeast nutrients. When you pitch the yeast starter into the carboy if you have any B-6 tablets, they do wounders to help yeast matabolize protein for duplicating. Five 100mg tablets crushed up & mixed in well with the must should work well enough for the yeast energizer.
Good luck and keep us informed,
A painting says a thousand words. But a painting while on good mead just looks funny!