I bought a horse who had not been vaccinated/ridden in 4 yrs.... after 2 weeks of riding him regularly- he was vaccinated. The next day he was swollen at the injection site and has been lame now on his front left for 4 weeks. Has anybody had issues with this? That side of his neck was where the 6 way vaccine was given....He is very visibly lame and cannot be ridden or even walk fast on his own..any suggestions....The vet and chiropractor and farrier have all been out... I have been cold water soaking that shoulder 2x daily and then massaging in thermaflex etc. He is also getting aniprin daily as well as arthrisoothe gold....any suggestions please?