I can't see, from anything you've said here, that you're a threat to yourself or anyone else. That being the case, there would be no grounds--at least in my state or any other I know about--for locking you up anywhere.

I think you need to tell your T everything, but I know you're probably not comfortable enough in the relationship to reveal all of this right away. Be honest, but let it happen when it can without feeling that it's being dragged or forced out of you. My opinion.

Others will check in. See how what they have to say clicks with you. In the end, it's your decision.