A: In short, I would call a local personal injury lawyer to discuss this issue. It seems that you simply don't have anything for your insurance company to reimburse you for, given that you don't have any medical treatment or damage to your vehicle.
As a more general matter, be careful to check your insurance policy to see what it covers. "Full coverage" isn't an actual insurance term. Overall, because of Texas law, most drivers purchase auto liability insurance, which pays to repair or replace the other driver's car and pays other people's medical expenses when you’re at fault in an accident. Importantly, liability insurance doesn't pay to repair or replace your car or to treat your injuries. Other types of coverages, including personal injury protection, uninsured or underinsured motorist, medical payments, collision, and comprehensive, can help you pay for these other expenses.
A: The attorneys on here will need a bit more information to answer your question. If I read it correctly, you're wondering whether you can file a lawsuit stemming from a car accident, then bypass the deposition process so that the case can get resolved at mediation. Unfortunately, that's not common practice. Normally, both sides will want to vet the case through the discovery/deposition process prior to mediating the case, given that the discovery/deposition process helps everyone determine what the basic facts of the case are.
A: It's very much worth contacting your attorney to sit down and discuss your case. Very often, your lawyer is doing a lot of background work that may not be evident (though a lawyer should generally keep his or her client informed throughout the process). This may be particularly true on an 18-wheeler case, where there is a lot of critical evidence that must be captured and evaluated. To answer your question, though, yes you can fire an attorney. I would be sure to review your contract with that attorney, though, to determine how this may affect your case (e.g., whether your attorney has an clauses regarding payment of the expenses it has already incurred).