Biting, Reactive, Dangerous Horse, or Pain Issues? Equine Ulcers

Bad Behavior or Pain Issues? One common trigger spot I see in equines who have ulcers. This mare has not been ridden or in any form of work for several years. She is often high alert, and small things trigger her insecurity and anticipation, causing her to be emotionally reactive. She does lie down and sleep, but for short periods. She's an IR candidate so the feed is specific, monitored, and offered multiple times per day. Experimenting with common dietary gut soothing supplements like Aloe, GutX 100, ulcer guard, and magnesium oxide have had effect.