A law suit for malpractice is going to cost you money. Do you have it? If so, you can get free consultations from lawyers to explore. Based on what you have said, and if it is accurate, then the lawyer did many things wrong. You could and should file a complaint with his local bar association and the GRIEVANCE committee in your region. Don't expect to get money back from that complaint and you will be contacted to answer questions and most likely a sit-down to o over matters. Given that you have been out of work, and you have not collected WC funds, I'm guessing that you're broke. Is that true? If it is true, then you might just seek a bankruptcy to discharge your debts and even the legal fees and costs that opposing counsel is trying to pursue.
You should certainly consult with an local attorney about a legal malpractice claim. Most attorneys offer a free consultation. You can always file a complaint with the Florida Bar, even if you do not pursue a legal malpractice claim.
Whether you will have to pay for any deposition fees or costs will be up to the judge to decide. Unless there is a statute or rule on point, then the judge will probably be interested in whether the claim or the need for a deposition was in response to a frivolous or meritless claim.