What happend to me?

I was in the bathroom and I was taking a shower. I didnt have the window or the heater on. When I was in the shower like 5 minutes through I started ot get puffed liek I was running out of breathe so I stopped and quickly finished washing my hair. When I was drying myself it just got worser so I went out of the bathroom and slowley went away. When I was in the bathroom idk if it was the heat but I felt like I was runnig out of breathe and I was exhausted and when I was wahsing and drying my hair my arms started to hurt .

Was it the heat or?

A shower is a confined area, heat causes the air to rise and air in a shower is saturated with moisture. That combination could make you dizzy.