The usual- costs, coverage, quality of life.
Are you sure nobody will cover it pre-existing? I saw Cigna has an international plan that might. It's likely the premiums will be very large. Maybe medical tourism could help with costs, like in Thailand.
On a side note, maybe it's possible to manufacture the drug yourself? I mean, what will the company do - sue someone who's already broke from paying for the meds?
I guess the other option is to find a different job, with a local company, that will provide insurance.