Do you call these panic attacks?

Okay so when i'm in a car or a bus or a vehicle, whenever I think something bad or going to happen, or when we take a turn and I get squished, I have a panic attack. When I think I have panic attacks, I start to breathe quicker, and my heart starts racing. And I start to hold on and ducking my head. It also happens when i'm stressed and don't know what to do. What do you think it is?