Before she was three, I almost lost Minnie to HGE. She stabilized after the first bout, then had 2-3 more in the course of a month. We finally scoped her and found she had IBD related (in part) to food allergies. She was eating exactly what she had for years, but it wasn't working for her any more.
She ended up on an extremely restricted diet: a new kibble with novel ingredients. Period.
As Batmom said, there are lots of options for treats. It turns out that kibble from one's pocket is much tastier than the stuff in the bowl. Eventually, I started to make potato chips (no additives, just slices dried in the oven), which was OK because her kibble included potato. I didn't try to get the meat (venison), but if it had been beef or something, I could have dried some plain strips. It is also possible to soften the kibble in water, reform it into more treat-like shapes, perhaps add some garlic powder to make it more interesting, and bake it again.
ETA: I just realized that this thread is several days old. I hope Chance is feeling better now.