Pink (((hugs))) I will go against the tide here and say, No don't tell him, yet. This might not need to be discussed in such intensity. Let your own self live with the experience a little bit. IF it doesn't diminish, as it normally would and probably should, then you can work at discussing why he touched your hand. It might be that you WERE "out there" and he was just helping to bring you back and ground you. (You know, similar to stomping your feet to feel?)
This is empowering you. He is establishing what I hope is a very safe relationship with you. It might appear to be larger than life because (

) you may have never experienced a safe relationship in your life. Everyone needs to be cared about, and that includes you. If T can express this caring, which any good T creates for a patient, then he can help you realize there are safe people in the world.
TC!