I understand that EPM is similar to stringhalt, which is called a disease, but it is actually a toxin overload. And can take up to 18 months to get over.
Would like to know where you live, I live in Australia, Victoria, near Ballarat, we have a bad case of stringhalt going around,
What we give to these horses is Vitamin B and Magnesium (epson salts) and a couple of handfuls of wheat, and don't give lucerne to them ( this has the toxins in it) normally it is not a prob. Keep of grass, lock up in dirt paddock, and as much work as the horse can cope with, and yes it can be fatal, Have heard of over 50 horses put down, and that's not the ones that have gone to the doggers or shot on private property.
I am in touch with a gentleman who is saving alot of these horses.
THought you might like to see what sign are in EPM and EPSM
Ataxia (incoordination), Spasticity (stiff, stilted movements), abnormal gait or lameness -.
1.) Incoordination and weakness which worsens when going up or down slopes or when head is elevated -
2.) Muscle atrophy, most noticeable along the topline or in the large muscles of the hindquarters, but can sometimes involve the muscles of the face or front limbs.
3.) Paralysis of muscles of the eyes, face or mouth, evident by drooping eyes, ears or lips
4.) Difficulty swallowing .
5.) Seizures or collapse -
6.) Abnormal sweating -
7.) Loss of sensation along the face, neck or body
8.) Head tilt with poor balance; horse may assume a splay-footed stance or lean against stall walls for support.
1.) Gait abnormality (including stiff gait, difficulty cantering, odd hind limb action, stifle problems, but not including shivers):
2.) Tying up:
3.) Lack of energy and/or poor performance:
4.) Muscle loss or poor muscling:
5.) Severe generalized weakness (these horses had difficulty standing up after lying down).
7.) Behavior problems in harness or under saddle:
8.) Back pain or total body pain:
9.) Difficulty with trimming hooves or shoeing:
10.)Weakness in the hind limbs:
11.) Episodic colic:
You could try supplementation with vitamin E, probiotics and corn oil, and a high in fat diet.
Hope this can help you.