Well you have had the benefit of Union membership, even if you haven’t had to use it or don’t recognise that you have it. A bit like insurance really, everyone has it but hopes not to have to use it.
So, if you had been bullied by a senior member of staff, you would have gone to your union, if you had been physically attacked by a patient your Union would have helped you negotiated compensation. If you needed legal advice about your contract,or other issues your union would provide up to date and relevant advice through specialist legal channels.. Your Union has negotiated pay, hours, and levels of responsibility at all the different levels of your career, if you are a woman your Union has negotiated maternity pay, the right to time off for maternity related appointments, maternity leave, parental leave, compassionate leave. Your Union has overseen health and safety working practices in the workplace, and lone worker safety procedures outside it. Your job would look very different today if your Union had not actively negotiated on your behalf, and the only reason the Union has the influence to negotiate is because of the number of its members. It is vital that workers in all sorts of Unions make sure they join and support their Union, non union members and non unionised workplaces are low hanging fruit for employers.
A colleague of mine was falsely accused of something , the accusation coinciding with a holiday period so she was not in work, she was not a member of the Union, our employers immediately instructed senior members of staff, including the Union rep acting as an advisor, not to contact her even as friends under threat of action being taken against them, she had to find and fund her own legal advisors, who weren’t experts in the field and gave her poor out of date information. She was on her own until the charge was withdrawn two weeks later and was admitted to have been malicious. She was almost destroyed by the process and the lack of support .
So OP, you might not have asked your Union for help, but believe me, they have been there for you, and you have had the benefit of membership, you have just been lucky enough not to need specific help for a specific reason.