I’m not on anxiety meds or hormonal meds (not allowed due to other health issues) but I slowly have come back from something similar to the OP! I had my heart horse for 10 years until I lost him l just over a year ago BUT he did do a number on my confidence. He suffered with DGE and when his ulcers flared he had a mean buck on landing, or even flatting (think drop the shoulder, spin and buck) . While he was the perfect amateur horse otherwise, it was that 5% that made him not….but due to his health issues, he was never for sale! While I won lots I also ate dirt lots!
Then after he passed my trainer thought I’d get along with her lovely hunter….sadly I did not! She just couldn’t deal with my nerves (which came out), she had a super round jump which I discovered I could not sit and I also discovered a very bad habit…,I lean to the left (even sitting in chairs my shoulders aren’t even and my left mastectomy doesn’t help!). While I loved her on the flat, over fences my confidence took a beating , especially after one fall (minor but I hit just right and knocked myself out) …after that nope, not jumping again!
So,trainer put me on a trusted, safe, school horse. After a pole lesson I felt great….this was fun! A month later I was jumping 2ft6 (schooling 2ft9) ….yes small but I didn’t care! I felt safe I could keep my balance, she wasn’t a round jumper, she also wasn’t a hunter but a jumper and I redound my love of the jumper ring! I’ve decided I will now just ride school horses for fun (plus I don’t want the expanse of horse owning anymore)…,I did end up taking this lovely school mare to TBird last year…for my last show, won champion and retired from showing happy!
Yes, you CAN get your confidence back…it just takes the right horse and a patient trainer!