Thanks for your question. You can apply to modify the alimony in Florida. You must complete the attached form and show change in circumstances. You may need to obtain an attorney to represent you in this matter.

You are going to have to deal and get around the fact that you signed the decree agreeing to this along with I'm assuming your attorney. You do have little to loose here and a lot to gain. I hope this gets you started and some ideas in the matter and good luck..

http://www.flcourts.org/gen_public/family/forms_rules/905c.pdf

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