The meds could be a major handicap for you, especially since you are only able to bring a 30 day supply down.
So many RX's are simply not available here (my migraine ones, my husbands BP ones). We try to order them, but there are delays,etc, which can be scary.
One option you should explore perhaps: There is a mailbox express that will allow you to ship to an address in MIA and import to Belize, but I am not sure how Medications are handled with customs. If you were set up on mail order refills, and had your prescriptions in the box, that might work.
If you figure out a way to get what you need, please let everyone else know as well