Can anybody help me with this? My Tennessee Walker/Saddlebred mare has EMS (equine metabolic syndrome), horse diabetes. She was doing really well no laminitus no symptoms. Her diet is grass hay with lunch of  soaked beet pulp, cinnamon, SmartPak IR (for insulin resistant horses), 1 small scoop LMF (low carb pellets), Remission (for insulin resistant horses and MSM (sulphur).

She was great all spring and summer season but as winter has closed in she rides out strong and fine (we have hills here and a covered arena) but when almost home from a 2 hr ride she acts drunk, wobbley, misses footing. This is new, all summer we could ride for 2 - 5 hrs with none of these symptoms.

Has anyone had this or seen it before?