More concretely, are you suggesting that US and European doctors are ignoring science about MS and just take the money? And the Mexican doctors at this clinic somehow magically have a cure which the rest of the world, at least the western world, ignores to ... enrich themselves?
Seriosly, this sounds very dubious. I'd caution the poster to get into fishy recommendations and blindly trust a stranger on the internet based on hope. Especially out of desperation.
And I find it deeply unethical to get the hopes up for somebody so desperate for a solution as the poster is. Their condition and outlook are bad enough, they don't need to be tricked on top of that. One of the huge red flags is the hush-hush "I'll send you a mail" Why this secrecy?
I urge you to either put evidence if your claims on the table or stop posting this kind of thing.