Having also worked in this field for a time, firstly with Cat. 3 children in a special school ....we had training and refresher courses every year ....plus anti tetanus injections in case of biting ......and training on restraint techniques ...as obviously we also had three sheets of 'instructions' in case of violence .....such as if a child cuts itself or is badly injured we were not to touch it but summon the school nurse ...but then had to hope the parent had signed consent for any treatment ...this included emergency treatment, or the need for an ambulance ( always struck me as a bit odd....if my child had been injured at a school I would have hoped help would have been summoned even if they couldn't get hold of me to consent !! ...I suppose this reflects the compensation culture !) We also had a rule whereby if possible, no member of staff should be alone with a child ...again, if a child went home with bruising and a parent complained, a witness could verify the child had fallen etc in the playground ..... and also, you should notify the headteacher as well as your Union rep .a lot of people dislike Unions but working in that environment it safeguards you as well !
Personally, I think I would look round for another job ...maybe in the same field, but not hands on . Your child CPN teams may have an opening for assistance with children, or child and family therapy centre ....play centres for vulnerable children, contact centres for separated parents to have supervised access, etc ....ask a specialist child psychiatric unit ,,,or try your local MIND ..adults service but they will know what else is out there
but ...overall, no one knows what tomorrow brings, so I would be inclined to retire and spend some quality time with your husband and family ...It sounds as if you have done your bit, and you should still be eligible for a lump sum payment and a local authority pension when you reach the scheme's pensionable age !
Good luck with your decision !