I only know that it is common among people that struggle with mental health to worry that their issues aren't serious or severe enough to deserve the status of the actual diagnose. It does seems likely to me that issues from one part of ones life can affect another. Did your current struggles at work start after the traumatizing divorce?

To me it seems like you might have CPTSD. The C stands for complex, and has to do with how it is difficult to pinpoint the exact point where the situation became traumatic. It is used about situations that last longer than those that creates PTSD, and that for some reason seems impossible to get out of. A divorce proceeding and subsequent issues with kids sounds like it might check all the boxes, including how you seem to maybe have some sort of impostor syndrome regarding your trauma.

My own situation started making a lot more sense when I realized that I had CPTSD instead of PTSD. Maybe it will for you too.