((kelley))
It probably doesn't matter what you say or do ~ that parent is dealing with 1,000 forms of fear - over his son's addiction, health issues and who knows what else ~
The only suggestion I could give you would be if another outburst occurs - would be to possibly try in a calm voice to say something like. . .
"Sir, I understand you are upset and fearful of what may happen, but that is out of my control. I can't do anything about that. All we can do is hope for the best."
and if the outburst continues I might would also try. .
"Sir, it seems you need some space to process your anger right now ~ I believe the healthiest thing for everyone would be for me to give you some free time. I'm going to step away so you can have some alone time."
or if all else fails - you can simply say nothing at all. Just because he speaks, rants or raves doesn't mean you have to respond.
Prayers for good news on your BF's medical condition
PINK HUGS,
Rita