My story is set in the modern day and the character has been sustaining himself on a diet consisting of liquor and amphetimines. Occasional meals here and there. It's long term, habitual use. He's in his thirties and his body has definitely sustained wear and tear from the lifestyle. I'd class him as a functioning addict.
I've looked eorwid and wiki for how amphetimines effect the body and the withdrawal symptoms. But what I'm looking for is the order of physical symptoms from most likely to pronounce to least likely. How quickly they'd start appearing after missing his fix and how, if at all, alcohol consumption would help?