Symptoms of postpartum depression are similar to what happens normally following childbirth. They include difficulty sleeping, appetite changes, excessive fatigue, decreased libido, and frequent mood changes.
If your horse needs a topical medication along with a pain reliever, your veterinarian may have you apply a dimethyl sulfoxide, or DMSO, solution. DMSO is quickly absorbed through the skin and is especially good at relieving swelling, as it pulls moisture from tissues.
You need to work through the soreness and correct it with either veterinary care, chiropractic care or other alternative methods of treating soreness such as: acupuncture, lasers or magnets. You need to understand why the horse is not moving well and if it is an injury such as a strained tendon, then rest is the best option.