I think it is great you recognized the anger right after you hung up. I'd call him before Saturday and talk about that, how you're angry he's going to be gone (and afraid since he's been your support with your SI, etc.). I think the more you talk about it the more it will diffuse that particular problem (not the being away problem but some of the anger at his being away which you don't need on top of the being away). That might give you more "time" to make a plan for when he's away?