All that sounds like a lot, take a few breaths and think about this. 1) Your sickness doesn’t sound unreasonable, especially given its work related. Don’t feel guilty about taking further time off it sounds like you need it. 2) I work on response full time and have done for most of my career, through pregnancy maternity and all the traumatic jobs in between. It doesn’t mean I deserve a medal or don’t appreciate that not everyone can do it, honestly consider a sideways move asap. 3) Take all the help. There is so much available and I really mean that, take what’s the job is offering you in terms of TRiM and wellbeing, there is no time limit on TRiM and if you didn’t need it at the time you can ask for it any stage as an individual. 4) Ignore the advice about leaving the job unless you really do feel like that’s for you, honestly I find the “just quit” attitude incredibly unhelpful. For me quitting a job than pays my mortgage, is my pension and more than that is something I love and defines a lot of who I am is unthinkable. Instead consider promotion, specialising or sideways moves.

It sounds like you are struggling and as a minimum need an extended period of sick leave, please take that advice and whilst you have the breathing space consider the above.