Alternatives to Dexamphetamine in Mexico?

Hey there, I'm a professional poker player, and as such, I tend to travel around quite a bit. I recently arrived in Cabo San Lucas, Mexico. When I got here I realized I'd lost one of my packets of dexamphetamine, the one that happened to have all of my remaining dex in it.

I can't get dex here, I went to the hospital today and they need a certain kind of prescription pad to prescribe it, which they have "ran out of."

Adderall is available OTC at most pharmacies here, however both times I've tried to buy it I've ended up with either diet pills or, from what I can tell, MAOI's.

The problem is, I need dex to work. My work consists of long periods of repetitive actions, which, whilst extremely mentally engaging, require me to concentrate at a pretty intense level for hours on end. There is a series of tournaments starting this Sunday known as WCOOP. It's essentially the most important 3 weeks of the year to any professional online tournament grinder.

If anyone can give me some tips i'd appreciate it.