Mine was very anxious about things, which also showed as separation anxiety, anxiety about the saddle, tension during grooming/tacking, spookiness. He reacted to the ulcer touch points too.
The obvious ulcer flag was how he ate his hard feed. He was always one to bite his feed as he ate, and would lick his bowl clean. When he had ulcers he’d take a few bites, then a few nibbles, then start pushing the bowl around and just nosing the food.
I treated with generic omeprazole and it took almost 3 months to get them healed (no scope at this point). When he started showing his ulcer signs again I did 4 weeks of Gastroguard, scoped him and got another 4 weeks of Gastroguard (free), which I used to do 2 more weeks of full doses and tapered off over the next three weeks. Rescope looked good and the ulcers didn’t come back.
The caveat here is that I had owned him since he was a foal and he’d never had ulcer issues. My gut was that there was a reason he got them, and why it was so difficult to get rid of them. He was diagnosed as neurological at the same vet visit we got the Gastroguard the first time.