Have I been discriminated against and/or neglected medical care?

Go to a University Hospital ER for the treatment you need.

Can I sue the hospital for patient profiling I wasn't treated fairly

If the MRI revealed nothing they could treat then you would have no cause of action.

Can I sue my dentist due to them taking the wrong tooth out??

You can sue but the monetary value would likely not justify the cost.

I agree with the post by Attorney Wolf that you cannot have the passengers sign such a release for negligent acts - only assumption of the risk.

Can ex wife petition to terminate his parental rights?

Agree with the post that on these facts a court is unlikely to terminate his parental rights.

My son was killed a year ago by another driver

As posted, if the at fault driver has no assets, you would be spinning your wheels in a lawsuit.

Do I sue the hospital for the time spent during registration, getting me into a room to practice an emergency c section?

As posted, you need to gather your medical records for a review by medical malpractice counsel to determine if the delay was the cause of death.

Body shop asking me to sign a document prior to retaking possession of my car

You should review the document with an attorney before signing it. Can't really give an answer here without seeing the document.

What should I do at this point? It's been almost a month, can I get the 911 call?

You should hire a personal injury attorney who will help get all the records.

If you were driving without a driver's license in Massachusetts, does your auto insurance have to cover any claims against you?

This will be governed by the terms of your policy - and the exclusions.