She’s gone through a lot recently. Doing a trial of ulcer meds makes perfect sense. My horse was recently unusually hot/reactive and a course of ulcer meds solved that problem right up. Worth reading the Nexium/Esomeprazole thread or at least parts of it. There are several proper (though small) investigations showing it is just as effective if not more so than omeprazole.
I have had good results with 1 bottle of esomeprazole = 1 tube of Ulcergard and treat accordingly (a 14-capsule bottle a day for 2 weeks, then titrate down for the next 2-3 weeks) but others have a different approach.
Cheapest esomeprazole is frequently Costco but Amazon has lots of generic options. YMMV but if it’s ulcers I tend to see some sort of result within a day or two.