Hey, Iwas here, welcome to the family! I am sorry to hear you are going through such a tough time. Dont worry, we have all been there. It seems the combination of Coronavirus and holidays have increased stress levels of our loved ones to unbearable.
Have there been other recent stressors in your life besides the obvious ones?
It sounds like you two were in therapy. Are you still under the care of a therapist ?
Suicide threats must be taken seriously and reported to a mental health professional asap. While a good support network is crucial, this is way too much for you to handle on your own.
Is your wife displaying symptoms of menopause? Trust me, menopausal rages can look like BPD

she should try some red clover tea and chaste berry to see if it helps.
We are here for you, browse the lessons above and other posts, and learn ways to a more peaceful home.