Hi there, welcome to the forum - and I want to say, how horribly sorry I am for what you and your beloved are going through. I wish you both the absolute best.
My Best Friend went though a horrible colic episode as well, where I almost lost him. I wouldn't of put him through the surgery *because he was 21 at the time and too old to be a candidate* so it was almost time to say goodbye - that's how close he came.
His colic was in his ceacum *sp?* - and thankfully, after 7 hours of trying very hard to get him to release, he saved himself. The Vet was prepping to do a tummy tap, and he was so exhausted, that he collapsed in his stall, and due to his body weight putting pressure down on his belly - out that gas came. Twice.
After that happened, my Vet and I had a good long discussion about what steps I needed to take, to ensure his health, happiness, longevity, and to keep this from happening again.
I instantly put him on 2 products through SmartPak. The first was SmartDigest Ultra, and TractGard. I did a full treatment of GastroGuard on Nelson, and also put him on SmartGut Pellets. These really did help. The reason why my fellow coliced, was because of ulcers. For your horse, I would suggest 2 products...
I had to change his lifestyle completely - which meant no more stall time. My Vet told the BO at the time when we were at that facility, that he could not spend another moment in a stall. He must be out 24/7, infront of a round bale.
Horses are meant to have roughage in their stomaches as much as possible. They are grazers, that is who they are, that is how they are created, their digestive systems require that - when you don't offer that, you are going to have issues that will start to show up slowly.
Of course, hydration is important as well - that's where the TractGard comes into play, this will help.
My fellow is out 24/7 - he is very, very happy being able to be out, to be a horse. If he were to be in a stall, that would mean hours of time without having any access to roughage - being out 24/7, means he has full access to a round bale, where he can stuff his face as much as possible, which helps that digestive system do its natural job.
He also gets fed 3 times a day, he gets brought into the barn, in his own little stall, where he can eat on his own, stress free, to get his grain and supplements.
The barn we are now at, are doing all they can, to accomodate my horses needs and daily schedule to ensure his health. We moved from the previous barn *where he coliced* because they could not do this for him, and I feared for his health. We couldn't be more happier.
Here is an article written by SmartPak that I think will help you: Balancing Act - Designing A Diet For The Modern Horse