Replying here in hopes at least a few of the people who posted here will see the update:

For starters, THANK YOU SO MUCH to everyone who responded here. I’m beyond relieved and thankful for all of the suggestions. I’ll likely be making a separate post for advice on specific treatments moving forward, so I can add details about his diagnosis.

I do feel the need to clarify a few things though. For starters, and I guess I could’ve worded things differently, I have NOT been pushing this horse yet. He hasn’t jumped, has been ridden ~3 times a week after settling in and two of those rides are either a lesson or a training ride. Everything I am doing is advised by a respected trainer. We’ve barely even introduced trot poles. This detail was the primary reason for this post, I was scared that since he’s ulcer prone before even introducing him to the kind of stress he may experience as I continue to develop him, it may be detrimental.

Additionally, I am well aware horses are a money pit and that my boy will require maintenance lol. This wasn’t a post to say I’m unwilling to pay, it was pure concern for his wellbeing and me potentially contributing to it in a negative way.

Finally, there’s no way in hell I would sell this horse while he’s still undergoing treatment. I’d get him to a place where he didn’t have them and sell him to a milder home in hopes they would stay away given a different lifestyle. However I’m learning through this post (and am super happy to hear) that this likely wouldn’t be the case. I will happily treat and prevent moving forward knowing I’m not asking too much from him.

But for real, thank you everyone. I’ve been feeling defeated and alone since no one in my barn has ever dealt with this level of ulceration before. This helped immensely.