Put the horse in a QT tank and slowly bring the temp down to 68.... you will need to treat the horse with Diamox. It's a prescription drug so you will need to get it from a vet if you do not have any on hand.
Start doing this for 3 days and let us know if there is improvement. Here are the medication instructions.
ACETAZOLAMIDE (immersion) Dosage and Preparation Instructions for a 10g/38L Hospital Tank
Active Ingredient: Acetazolamide
Indication: gas bubble disease, edema, popeye
Brand Name: Diamox
Dose at 250mg per day for 3 days.
Replace the medication in ratio to the amount of water changed daily as needed to control ammonia.
Day 1 of Treatment
• Crush one 250mg tablet into a fine powder.
• Use a mini-blender or small hand-blender to thoroughly mix the powder with about 1 cup of marine
water.
• Allow the mixture to set for a few minutes.
• Gently pour off the dissolved portion of the mixture and discard any residue that has settled at the
bottom of the container. (Do NOT add the residue to the hospital tank).
• Pour the mixture into a high-flow area of the hospital tank.
Days 2 – 3 of Treatment
• Perform 50% water change.
• Repeat "Day 1" instructions