You really should have an attorney for a case like this. Check with local counsel but in Illinois you get two doctors of your choice, including the...

I was told by an employee to decline insurance when I rented a truck because I already had coverage through my auto insurance...

I think a better theory is that they rented you a deflective vehicle. Having said that the damages are probably not sufficient to file a case.

Before the Court, the defendant testified to the judge that in my complaint I wrote about UFOs, bagels and unicorns; not true.

Your complaint would speak for itself. There is no case in the facts presented.

Layers for Enbrel causing Squamous Cell skin cancers.

Use the finder and make some calls. You might want to start with a Med Mal attorney.

What is the difference in state and federal workers compensation

Consult a workers compensation attorney to determine which statute applies to your situation. Either way it looks like you are going to need an...

Do I have a personal injury case?

You might, consult a personal injury attorney.

Can I sue a hospital for malpractice because I developed sepsis and almost died while under their care?

Probably not worth filing but get your records and have them reviewed.

Can I sue the county jail caught a skin disease and they wouldn't treat it. Now I have scars on my back and legs.

Yes but that is a tough case. Consult local counsel.

Can they do this?

Yes they can. Please consult with a workers compensation attorney if you do not have one.

Can I be sued for a Facebook post?

Yes in theory but it is not likely as long as you did not post anything that is false.