I'm sorry you're not enjoying the break Jaynie.
Not sure I have any suggestions other than to find interesting things to do in the day - there must be no end of things to do in CostaRica...get a little you time in there
I find a fan can help. If the hotel has none for use, you buy a cheap fan for under $20 here in Australia... I'd imagine CR is, at worst, comparable to that in price?
maybe seek out a local AA meeting too? it might be good to have real life support right now?