I have a family member who is recovering from being a junkie. I believe that addiction is a form of self-medication gone wrong. Quite possibly there is an underlying parasite that made you feel off in the first place, and there may have been a trigger, for example, a friend's suicide, which was the case for the person mentioned.

So as @UpwardBound suggested, a little antiparasitical action won't hurt, and might even help, bigly. In any case, keep up the good work. One day at a time. Have you started going to the gym and supplementing with food and vitamins etc. to build up your muscles? A regular schedule can be a great boon in recovery.