You’re screwed.
If Florida law is like CA’s, your first is non-recourse, meaning they cannot go after your other assets, but can take the property back.
But if you have a HELOC, it probably is recourse, meaning they can pursue you & get a judgement. However, I am not a lawyer, every state is different, and even the general rules I cite above have exceptions & ongoing challenges as we speak. See a local attorney specializing in real estate. Yours is a common problem everywhere, & your attorney can quickly give you answers.