No similar experiences. It could be several different things, but I'm sure the vet will help figure things out tomorrow :) I'd ice for 15min on/off while your waiting for the vet to try and reduce inflammation or cold hose for 20min. Voltaren double strength, which you can buy at the drug store might also help you for today. Personally, I'm not a big fan of Bute unless It is absolutely necessary for pain or chronic inflammation or the Vet suggests It to be used. It is hard on a horse's stomach, liver, actually slows healing. If you do use It though, be sure to inform your vet on how much and when you used It. I hope everything goes well for you tomorrow :) I'd love to hear the vets diagnosis If you share.