Letloverule, first of all, congratulations on your anniversary.
I am sorry that you experience many frustrating and painful incidents. What you have described is a typical BPD evening spent with a nonBPD.
In my observations, many pwBPD have issues with one or both of their parents.
There may be a connection here with something you did that triggered memories of your W's mother. Do you know your in-laws well?
Have you thought about gently approaching your W to get into therapy? This is not easy as many people with PDs are in denial until some life crisis happens and they are forced to see the dysfunction.
https://bpdfamily.com/content/how-to-get-borderline-into-therapyHere is a short film on some tactics to end conflict:
https://bpdfamily.com/content/ending-conflictYou description of trauma is very common on the nonBPDs in relationships with pwBPD. Very, very common. You mention anxiety in your post. You may also have C-PTSD (Complex PTSD), which is a form of anxiety caused by emotional trauma over a period of time.
Please read this and see if it makes sense to you.
https://bpdfamily.com/content/codependency-codependent-relationshipsYou are not alone in feeling the way you do. Marriages are supposed to be happy and mutually supportive, but with BPDs, the nonBPD is the caretaker.