Thank you for adding paragraph breaks!
If you haven’t scoped and tested for ulcers, that is where I would start. Our vet is currently running a deal that comes with free gastrogard if you have your horse scoped, so four of my barnmates with spooky [edit: and/or tense/anxious] horses had them scoped and all four had ulcers. My mare also sees ghosts, so I am going to try and have her scoped as well before the deal expires.
Also, it sounds like your mare is worse while cycling, and she blew through Regumate so you took her off? That also happened with my mare. She was great while on the injectable compounded Regumate, but when I went back to oral, she broke through it several times, so I took her off. If I could afford it, I would put her back on the injectable. Is that an option for you?
Finally, my mare also sees ghosts, spooks at fences she has jumped while flatting - especially if they have moved (though doesn’t stop at them o/f), and is generally insecure. She really needs her rider (me) to be calm and in charge and - most importantly - committed to getting her past her meltdowns when she has them.
Meltdowns are pretty rare, it’s usually just being looky or a scoot or a tiny shy, which I don’t mind. (And thankfully, she doesn’t have a stop.) But if she has a meltdown, if I show any inkling of fear or hesitation, she will try and “save” us. I have had to learn how to work through that, and am finding that the more we work on it the less it’s a problem. For us, it’s while hacking out, so I do a lot of grazing and ground work in the scary areas, work with my trainer on how I should react, and hack out with buddies, not alone. Probably not something you would want in a junior hunter, though.
And, sorry, I didn’t intend to make you feel unwelcome, but I tried three times to read that block of text and could not get through.
Good luck!