Inducing panic symptoms

Well the next phase of my therapy has begun. We're inducing symptoms that are usually related to panic and could cause a panic attack. We started with breathing for a minute through a straw and not a drinking straw but one of those tiny thin ones that you use to stir your coffee. Imagine pinching your nose and breathing through your mouth through that tiny straw. Kinda scary and I was unable to keep it up for a minute straight without struggling for breath. The other exercise we did was heavy and hard breathing for a minute straight to emulate hyperventilation and I did get dizzy and anxious to the point my hands were shaking. I asked the therapist if he would leave at the end of session if I were having a panic attack and he declined to answer saying that he didn't want to allay my fears as I have to face them. Oddly enough at the end of session I did not have a panic attack. I was even able to use the urinal before leaving the office which was great. I guess that just because I have some strange body sensation, it's not necessary for it to turn into a panic attack. I have more to do like spinning in my seat for a minute straight designed to make me dizzy. Also, sitting in a chair with my head between my knees for a minute then straightening up real fast which would lead to wooziness and unsteadiness. This is going to be the toughest phase of therapy but I wanted to deal with the fear head on so here we go. I have to practice some of these exercises at home.