sorry to hear your horse is in so much pain! What is the paddock environment at the new place? Is it quite different than the place where your horse did not have an abscess? What do your farrier and vet recommend for treatment and/or boots, shoes? Does your horse get plenty of turnout or not much? How is the stall cleaning? Pellets or shavings?
These are the questions I would be asking myself….I know I’m not giving you answers, but perhaps food for thought?