Don't have much to add other than wishing you all the best with the difficult times you're going through. Mental Health provision over here has really taken a beating, and it's awful that your suffering has increased as a result.
Does seem like Mindfulness is the flavour of the month right now, but there are other approaches that might suit you better if that one isn't doing it for you, and hopefully your Doctor can offer advice on that. As people keep saying, things will get better, even if it's hard to see how right now. Having your family as motivation to get through this is hopefully a help for you.