((((((((((((((((LMo))))))))))))))))))
i'm so sorry. i don't see anything changing either until the friend leaves and hubby's "mood" changes. could he be grieving the dog or worried about something doing with the vaca? i don't know. also, you could ask friend to leave. i know that's more than difficult, but if he's not respecting your needs he should come back at a later time.
anyhow, my point is...you can't change them or their actions/thinking. it sounds like you are feeling the crunch of the massive upcoming vaca and trying to get it together with no one to help

you, however, can control how you react...even if it's just for an hour. can you go out in the back yard, take a long bath, something to relax for a bit?
have you explained to hubby what you're feeling and why. have you told him that you're really feeling stress right now and could use his help as a partner and helpmate in your life? sometimes when hubby doesn't get it, i do that. i ask instead of what he calls "demand". he tends to get rebellious and ignores me when i do that. i've been learning to take the things that i can't do on my own, present them to him as the "issue", and ask what we can do about it together. it works so much better that way. i think he really feels like he's helping instead of "just another one of the kids around here".
i wish you well. i know how frustrating it is.
be safe,
kd