Without spacing in your post, it is hard to read, but this sounds like a medical issue, not a legal issue.

Take your contract to your attorney and get their advice.

This complicated issue is much too in depth for this simply Q&A forum. You need your own attorney(s.)

I want to know what I can do or how I can stop this from happening to others. You can't. Protect yourself and your kids. Period.

It's pretty high at the top of the list......................

You will need a doctor to opine that the negligence of the plasma center cause his clot.

This is a general Q&A site. You should hire a lawyer to assist you.

If you are asking about attorney's fees, you have an attorney. Ask them.

Your lawyer will know exactly what to do. This is not a DIY project.

your damages are limited to what you were overcharged. So, unless it is tens of thousands of dollars I doubt any lawyer will get involved.