Hi!
I backpacked around Asia for 2 years, working sometimes too, my alcoholism was really bad there, except one time I stayed sober for about 3 weeks in Thailand of all places.
I met so many alcoholic expats, drug addicts too :/
The good news is that travel is better off the drink, I was sober in Istanbul, Ireland (weird I know) and almost sober backpacking in Cuba ( a small slip) a couple weeks ago. I'll never be a drunk traveller again.
You can do it, good call going to the jungle to trek!!
Come back and let us know how it was!!!