Help with cost of divorce in Florida?

I have officially been separated from my husband for the past 6 months. His drug and alcohol addiction that has spanned a decade was something I would no longer cope with and he is back in rehab for the 2nd time in 5 months. I want to divorce him, but don’t have 1000’s of dollars to spend. I pretty much live pay check to pay check trying hard to support my 3 year old son and myself. Any ideas? Is there a way to do it for a lower cost or have aid?