Sounds like he is A typical of an addict. The behaviours you describe is fitting, however I’m sure drugs are not an “all fits one” as in it would be unfair to state that they all act the same.
Saying that tho the behaviours you are describing is pretty similar to many stories I’ve read, in regards to cocaine.
Cocaine is a stimulant, so the “leading up to” is like the hunt, then the “not caring” is the kill so to speak. It’s a come down. I’d suggest reading a bit more about the affects online and and YouTube so you can explore other views and not just on these threads.