I'm so sorry to hear this

My old mare had something similar happen. She was fine in the morning when I fed, but by afternoon she was displaying neurological symptoms like circling instead of walking straight. We actually got her in the trailer the next morning and  took her to the vet clinic. They did a bunch of neurological tests on her and determined she had what was called Sidewinders, which can randomly appear in older horses. She was 27. The vet said I could take her home and keep her on meds to try and prevent it from getting worse, but that she would not improve. I decided to put her down that day. Her knees were already bad and I could tell she was getting tired and it hadn’t even been 24 hours. I also didn’t want to haul her again it was so stressful. While it was super hard putting her to sleep, I feel good about my decision. I was so worried I would find her down and unable to get up and I didn’t want her to suffer. 

I'm so sorry for your loss. It hurts. We just put down our boy Monday due to laminitis. Prayers for your comfort. 

I'm so very sorry for your loss; it is so hard. . . Prayers that each day gets better

Hello everyone,

I am new to this forum so I "hope" I'm doing this correctly. Kianna your post really caught my attention, as I had a very similar experience with my 28 year old mare.  Please accept my sincerest condolences on the loss of your sweet boy... I wish I had joined and had seen your post earlier.  My mare's symptoms (each horse may present with different symptoms) were very subtle in the beginning. (I bought her as a 3 year old so I knew her like the back of my hand.)  The first thing I noticed was an odd "head tick" for lack of a better description.  Within a matter of weeks she progressed to going off feed, very apparent muscle wasting, stumbling, reluctance to move at all really, and a wobbling/swaying gait behind.  My vet diagnosed her with EMP... I disagreed...... Did my own research..... and discovered that she was actually suffering from vitamin E deficiency, which can, and does mimic EPM.  I started her on a good all natural vitamin E supplement. (I used "Elevate" per instructions on the container, but there are many good products on the market.)  Within 5 days she was much improved.  By day 10 she was back to normal and symptom free.  It pains me that most vets, even the good ones will miss diagnose this condition. Horses especially elderly horses with bad teeth, or ones that lack sufficient chewing surface on their teeth) are at greatest risk for vitamin E deficiency. As are stalled horses with little or no access to good pasture, or on hay-only diets, especially of a lesser quality hay.  It is almost un-heard of in horses with proper green-pasture turnout.  (Or horses that still have well maintained good teeth and fed a good quality hay.)   PLEASE, please, for your horse's sake do your own research on this condition.  There is appropriate testing for it also that can be done by your vet.  Be your horses' own best advocate.