Some have expressed concern due to the needle-in-vein photo, thinking it some sort of cry for HELP (what a watery-looking hit it was anyway...), so: empty bottle methadone, empty strips of various tablets. 2nd day no opiate-receptor-binding chemicals whatever.
You can talk about withdrawals, but really, you can have a bad time and dark thoughts on a rough day no matter what it's brought about by. Don't want my life-story to turn into a catalogue of the chemical influences I put in my head (because my diary has...)
This is normality. We are always programming our brain chemistries, one way or another. How much qualitative difference between the nine-to-five/Eastenders/Prozac zombie, and the heroin zombie?