No you can't sue. You have no legal right to be on their property, and they can ban you for any, or no reason.

Besides issues with immunity, nothing in your post gives grounds for a lawsuit IMO. You made the decision. Even if their advice was faulty, it was...

The loan is a contract between you and the borrower. They would have to agree to let you out of the contract, and they have no reason to do so.

IMO this is entirely appropriate and, even if it wasn't, is not a legal issue. Nothing done here violates any law.

Likely none. Absent a serious injury, the cost of a lawsuit would far outweigh any potential recovery.

Your legal remedy is to file for divorce. There is no other means to sue your husband........................................

I need a lawyer for in-laws verbally harassing me and for indecent exposure This is a Q&A forum. You have not asked a question.

Yes it is legal. Ask your parents to speak to the school and propose possible alternatives...............................

No. The Post Office is exempt from lawsuit under the Federal Torts Claim Act when it comes to delivering mail.

No, it is not illegal. That doesn't mean the school can't discipline the teacher, but it is not illegal.