Since none of us knows anything about your case we cannot even hazard a guess.

While none of us can know for certain, felon possessing a firearm is a federal crime.

You can't sue for inconvenience or being stressed out.

This is a Q&A site. You have not asked a question.

You leave out a lot of facts. Was this your own home? A hotel? Apartment? Did the owner know there were rats? All these things matter.

Ask her parents. An adult who is interested in children may have mental health issues.

Given that you have already tipped your PO off, I think the odds of them finding out are very high. What if you get called in for a random drug...

These cases almost always fail, due to the lack of any legally recognizable damages.

Actually not a HIPAA violation, as set out above.

I don't see how you will prevail in a lawsuit. Your ticket that you purchased, and agreed to the terms, likely limits their liability completely.