Have you noticed any of these additional symptoms?
-first had the "twitch" which is the vertical and horizontal head toss and it becomes frequent at times to calm
-began to hate his nose being touch (he used to loved being pat him on his nose)
- lips will twitch non stop at times
- has nasal/eye discharge
- likes to hide his head at times such as in a corner of barn, under trees, and even other horses tails.
- will rub his nose on his front foreleg or on other objects
-And he tends to zone a lot and just freeze which he used to not do that
*** Also what breed is you horse?