There is nothing wrong with your boss obtaining texts from this employee if he/she gave them voluntarily.

What do I do about being discriminated against because of my weight?

In most states, weight is not a protected class, thus it is not illegal to discriminate because of weight.

Is a message left on telephone answering machine waiver of privacy right

Yes.

Civil rights. Constitutional rights.

This question would only involve a Civil Rights issue if the ambulance was a government organization and if the membership restriction was...