I have some training in gestalt and my ex t was gestalt. I eventually had to leave her because I didn't like the way she was doing therapy with me. We used to do the occasional experiment ( empty chair, switching chairs, talking to parts of yourself). I didn't mind it now and again but if t had of done it on my first session I don't think I would have gone back. T was more interested in getting me to feel my emotions and noticing what was happening in my body. She often used a technique that I began to hate. If I got angry or upset she would mimic me but really exaggerate me by pretending to be a child. I really hated that and asked her to stop but she continued.
I felt bullied and intimidated by her in the end. People often talk about Fritz Perls ( the founder of gestalt ) being a bullying psychopath.
I would trust your instinct on this and either try a new t or tell this t that he was using to many experiments and you felt discombobulated after session. Sometimes with gestalt therapists and I really noticed that in my training with them that the therapy is more about them than the client.