Ruling out pain issues in a spooky horse is essential. One of the main causes of spooking, in my opinion, is discomfort. This could be musculoskeletal discomfort such as joint pain or muscle spasm, or internal discomfort such as hormonal dysfunction or gastric ulcers.
Contact your vet and your local Registered Animal Musculoskeletal Practitioner (www.rampregister.org) or ACPAT Chartered Physiotherapist (www.acpat.org) for a detailed assessment specifically in relation to the spooky behaviour. If you’ve ruled out pain as the cause, and would like more hands on help, you can contact your local Intelligent Horsemanship Recommended Trainer (www.intelligenthorsemanship.co.uk), or your local BHS Accredited Professional (www.bhs.org.uk).