I am not that familiar with Florida W/C statutes, you may want to browse Florida’s State website, which should have all of the W/C rules for you to review.
Mediation is basically a meeting between an injured employee, and if he or she has an attorney they would also attend, their employer’s insurance companies representative and a mediator representing the State of Florida. Usually a mediation hearing is held to resolve a disputed claim and/or treatment plan or component of a claim, so I am willing to bet that your husband’s employer may be disputing any responsibility towards your husbands’ injury.
As far as the “Lifetime medical treatment” goes this is usually discussed at the end of a claim and does not always mean “Lifetime” either (read the fine print). The insurance company will try and get away with…well lets face it, the least amount out of their pocket as possible, so keep after your attorney and double check their work whenever possible, they are in it for the money too, however, the larger the settlement, the larger their cut is, but my advice would be to still keep a close eye on them and make sure that they are earning their money. Another must is, Documentation! Documentation! Documentation! Make sure that your husband writes down as much as he can remember about what happened, along with any witnesses, etc. Good Luck.