Hey! There are lots of ways to help ulcers. I work with racehorses, and the statistic is that 95% of racehorses have ulcers. We treat ALL our stock for ulcers to some extent. Mostly we run a preventative program. If your horse gets a lot of concentrate (grain) feed in many small meals instead of one or 2 large meals. Keep him on pasture as much as you can. Try to ensure he drinks a lot. There are products from the vet (Gastroguard) that are VERY expensive. They are amazing, but unless your horse is showing other signs of an ulcer, I would not go that route. If you have a good feedstore, or even better a racetrack with a tack store, go in there and see what they have in the way of daily suplements. There are many that can be used with great success. If you are still worried, take a blood and have it assessed. There are markers on bloodwork that can indicate ulcers. They are working on a urine test now to diagnose - elevated sugar in the urine can mean ulcer. Tha only way I have seen a vet definitively diagnose ulcers is through gastroscope. Your vet may not even have a gastroscope.
I'm sure your MT is great, but just because your horse was a litttle sore doesn't mean it has ulcers - try not to worry too much. They are so common and can be managed without breaking the bank. Look up some of the research online. I'll try and find the links to some great studies and post them for you.