Welcome! I'm prone to seasickness, but I've been able to manage it well enough to get in dozens of boat dives a year. I take Bonine/meclizine the night before and the morning of, as others have suggested. I keep ginger gum in my bag and chew it as soon as I feel the slightest discomfort. Carbonated beverages can also help settle a queasy stomach. I bring a jacket (might not be necessary in Florida) so I can stay outside; the breeze in my face helps a lot. I also find that the more I go out on boats, the easier it gets. Hang in there!