So I have to be the annoying devil's advocate here, along with two others who actually can speak correctly.
You should DE-worm
your horse. Not worm them.
Couldn't help it.
Just a little pet peeve of mine. I especially hate it when the horse supply catalogs even list "wormers" at the top of the pages. You are not putting worms into your horse!!!!!
But I agree with everyone's advice on your barn moving situation, and your horse's health. A vet check is certainly the best way to go here.