I know in my home town in the mid decade a lot of ice was cut with synthetic cathinones and some of those numb your throat and have mechanisms of action that are somewhere between real amps and cocaine. Meth mixed with something like caths or coke is especially dangerous IMO. Meth releases a shit ton of dopamine and I wanna say it raises DA brain levels by 2000% (?) And then you gotta remember ur also adding a Dopamine Reuptake inhibitor which basically entraps that toxically high amount of dopamine in your brain for a good while. I'm no expert in pharmacology, neurochemistry, a health professional or anything close to any of those things. But it just don't sound good and from so many repeated experiences it feels very cardiotoxic. Does this numbing batch cause more tightness in your chest than usual and sometimes make it kinda hard to breath? Do are your ears like popping real bad to where your voice sounds real loud in ur head when u speak? I have recognized these as classic Cathinone cut give aways.
Weird thing is I just bought some from my neighbor that sound ls just like what u got. Mostly powder with lil rocks. If you smoke those rocks and they don't taste like orange peeling infused pleasant chem taste (that classic meth smoke taste; some discribe it as slightly unripe green apple peel taste which I would also agreed to) but rather they taste something more like a sickly sweet taste or even a cat piss like taste then u definitely got cathinone cut dope. Caths are cheap and amp-like and most of them are legal. Active cuts have become the go to with dealers these days as opposed to the days of MSM, Epsom, and Isopropylbenzobullshit shards, much like active fentalogue cuts have replaced the old sucralose heroin cuts and what not. I'm pretty sure mine is shake n bake meth plus Cath crystals. I say that cuz I did a straight shot of the powder and it gave me that awesome "blow your hair back" and knock the breath out ya (in a good way) rush with that intense euphoria that comes with banging Racemic dope (Shake n bake, Birch reduction shards etc.) -- not that I'd EVER recommend banging shake. But anyways, Andafter the rush subsided I noticed had no legs which is just like injected shake behaves in most cases.
Then when I did a shot of just the Rocky lil shards it felt like all my other experiences with injected caths. Intense anxiety, tightness in chest, need to catch breath, dull euphoria, lotta dizziness. Extreme craving for a benzos to make the experience more enjoyable. That whole chestnut.