You sound really drained. I wouldn't rule out some sort of health thing- iron? thyroid? mysterious energy-draining bug? If you just keep on keeping on, things will get better eventually. Non-rainy season coming?

Also, I actually think coming back, although it won't solve all your problems in life, will leave you with a rosier picture of Guatemala. Things look better when you're showered and barefoot... all those "interesting cultural experiences" will be awesome when you don't have to deal with them anymore!