Jabberwocky
Frumious Bandersnatch
I was doing some light reading, and I came across this citation referencing how to significantly reduce or abolish the tachycardia (hi heart rate), high blood pressure, Vasoconstriction, etc caused by dopamine and norepinephrine overload.
pubmed.ncbi.nlm.nih.gov
"Both drugs produced significant reduction in pulse, systolic blood pressure, respiratory rate, and temperature over 60 min. We conclude droperidol produces a more rapid and profound sedation than lorazepam for methamphetamine toxicity. Lorazepam is more likely to require repeat dosing than droperidol."
So it's better than benzodiazepines. I don't believe it's controlled. This might be something that you could buy in Mexico. Very cheaply. And you would have a way to reverse methamphetamine intoxication when you're doing too much.

Methamphetamine toxicity: treatment with a benzodiazepine versus a butyrophenone - PubMed
Patients with methamphetamine toxicity often present to the emergency department (ED) agitated, violent and psychotic. To determine the efficacy of a benzodiazepine versus a butyrophenone for chemical restraint we conducted a prospective, randomized study at a large urban university ED between...

"Both drugs produced significant reduction in pulse, systolic blood pressure, respiratory rate, and temperature over 60 min. We conclude droperidol produces a more rapid and profound sedation than lorazepam for methamphetamine toxicity. Lorazepam is more likely to require repeat dosing than droperidol."
So it's better than benzodiazepines. I don't believe it's controlled. This might be something that you could buy in Mexico. Very cheaply. And you would have a way to reverse methamphetamine intoxication when you're doing too much.