update: he's fine! he finally called (20 minutes into my massage . . .) and apparently making a phone call was a lot harder than he thought. i have never left that place so much more relaxed than i came in!!! i'm so relieved. thank you to all for your logical words of wisdom! you were right :)
josh called on wednesday night -- the night he arrived in nicaragua. i was half asleep, but i am 100% sure he promised to call the very night evening.
but then he didn't.
and then he didn't, again.
i'm trying not to panic. i'm trying not to freak out. but when your husband is in another country in which you do not speak the language and you were provided with absolutely no contact information whatsoever, and you do not get phones calls from him when they were promised, and you're someone with my degree of co-dependence and paranoia --
WELL, IT'S JUST NOT IDEAL.
i really really hope i hear from him soon.