OP, I was you about 6 years ago. It wasn’t my first horse, but it was my first horse in about 20 years as a re-riding adult. I bought a TB, nice prospect from a reputable reseller. I got him in August. He showed immediate signs of ulcers, so we treated. In October he fractured his splint bone, which resulted in surgery. While he was at the vet for the spint removal, I x-rayed his back because he had been displaying some soreness. Boom. Kissing spine. Meanwhile we struggled with his front feet - thin soles, underrun heels, zero hoof wall, etc. My vet recommended going straight in for the lig snip. He went to Tufts for surgery, got a bone scan first to make sure his back was his primary issue, and then came home to start the rehab.
It was an utterly emotionally exhausting sh*tshow. I didn’t ride for months after getting my “first” horse. All my time and money poured into him. I needed a break badly.
He had the surgery in January. We did the recommeded stall rest and rehab. I sat on him in April, he still wasn’t ready - and then in May, after another month of intense rehab, he was strong enough to start back undersaddle. He came back better than before (oh hey, right lead, thanks for making an appearance!). But he still wasn’t right.
A little while later he was sore in his right stifle. X-rayed. Bone cyst. Injected.
Back into work he went. Still “better” but not perfect. At least rideable. But horse was an absolute chicken about everything and fairly unpredictable undersaddle - not dangerous, but could be balky and did have a buck. He had good days and bad.
Then came the EPM diagnosis. He wasn’t neuro, but would “tie up” when stressed (i.e. ridden) during hot, humid days. Treated, again he was “better.”
This whole time (a couple years of chasing and treating diagnoses) we never lost focus on rehabbing his front feet.
A year or so after getting him “good” he started to gas colic intermittently. Landed in the horsepital after one really bad episode. Ultrasound, scope - ulcers were back.
I spent 4-5 years trying to get this horse comfortable and rideable for my ever evolving and downgraded goals for him. We never got there.
I am incrediby lucky that during all of this I was able to buy a farm and bring him home. Which meant that he needed a buddy, which meant that I eventually also had a rideable horse.
Last summer I stopped riding him entirely. We were both miserable trying to make it happen. I have never loved this horse more - he is happy, I am happy. Literally just yesterday I pulled his shoes and he entered “official” retirement. He has a marem to watch over now and he takes his job very very seriously. That’s enough for me. lol
I know I am in a really fortunate spot to be able to keep him. And I tell you this story not just to let you know that YOU ARE NOT ALONE. But also give you permission to start over. If I didn’t have the space and resources to give him a happy retirement (he’s ony 13, sigh), euthanasia would not have been a wrong choice. He’s not a horse I would EVER sell or give away. He absolutely would have ended up in a terrible place.
Looking back, my journey with him has been really really miserable. But he also set me on a path that I would not change for the world. I have learned an incredible amount because of him. And he has only made me better for the other horses in my life.
It’s ok to learn from your mare, recognize that you both served a purpose in each other’s lives, and then move on - whatever that ends up looking like.
The one ‘regret’ I have with him is jumping to KS surgery straight away. Had I known what we know now, I would have tried rehab and correct work first. To be honest, his xrays didn’t look half as bad as your mare’s - but he was quite symptomatic. I don’t think that skipping surgery would have resulted in a different outcome for him, but it would have saved both of us a great deal of stress, pain, and, of course, money.
Hang in there. You’ve been dealt a crappy hand, to be sure. But you have options.