I havenāt read all of the replies, so Iām sure youāve gotten a lot of great advice and questions asked. I think I saw ulcers mentioned, and that was my first thought. I saw in one of your own posts the thought of pain, and thatās also my thought.
My gelding went through a time like this when I moved him to a boarding barn after his last remaining buddy passed away and I sold my farm. My gelding had lived on that farm since he was a yearling and was 10 when I moved him. He seemed to do okay at first, but eventually his behavior declined and he eventually got so stressed out by being brought into or even NEAR the barn (he was pasture boarded, but needed to come in for grooming, tacking, etc.) that heād attempt to turn and not run but slowly drag me back toward the pasture. I had to be super firm and diligent about keeping his attention, and all that wound up doing was getting me into the barn with a horse that was then on high-alert, completely bugging out and inconsolable. There were times I couldnāt keep him in the barn aisle because he was so uptight and anxious he was literally trembling, wild-eyed, and just desperate to be out of there. I worked and worked and worked with him, and some days I would break down crying because my quiet, sensible, sweet boy was an absolute basket case and I couldnāt figure out why.
Long story short: his back was sore and would go into spasms when heād get a little uptight, and then it was like a vicious cycle of him anticipating the muscle spasms, that tension causing the muscle spasms, and then him trying to escape the muscle spasms and just getting more and more frantic. It was literally like watching a horse being attacked by his own body. It was so upsetting to see HIM that upset and obviously terrified.
I moved him to a barn he preferred, but he was always still just a touch wary now and then. It wasnāt until I moved him to his current barn that he went full-throttle nuts and I honestly thought he was going to have a heart attack. Thatās when (duh) I finally decided to try some tubes of Ulcergard. Bingo. Two days in he was drastically improved. By the time he finished a whole 28-day treatment, my bank account was hurting but my horse was back to his old self. Happy as a clam. And I realized that heād probably had the ulcers since leaving the farm where his friends were buried and heād grown up. The ulcers probably played a role in the back tension (though saddle fit and need of a better farrier played a role in that as well).
Oh, and my guy was buddy sour during his crazy time at the first farm. Very uncharacteristically so. Now? Pfft. He couldnāt care less. His pasture friend (a mare) calls for him pretty consistently when heās off being ridden or whatever and he never answers her. Itās like he doesnāt hear her.
Ulcers. Backs. Pain. I think they exacerbate the buddying up because horses feel more vulnerable when theyāre in pain, so they look for the comfort of company as herd animals.