Don't use your age against yourself before you even try!
You have a job now right? You can get another.
Start applying now, anywhere, everywhere. I don't understand why people stay in jobs where they are miserable, expecting the company to change and everything to get all better.
Companies will continue to treat employees poorly as long as they are able to. They have no reason to change.
Yes, you have challenges, but not ones that can't be overcome. If you need to, you can purchase short term health insurance while you are waiting for your insurance to kick in at your new job.
Advice I have had to give myself many, many times Mr. Barrick, The world will not change to suit you, no matter how much you complain, or how unfair it is. Actions speak louder than words. Nothing much in life is fair.
Good luck to you!