how do u know?

Hi,
I recently start recieving these rapidly strong heartbeats and its very uncomfortable. At times I breathe really hard too and really need to sit down or move in a different position. It happens alot. I was studying last night and that happened over 5 times. I tried to go to sleep last night and it happened too, but when i raise my arm up to open my lungs, it didnt work. When i'm in class it happens also. it dont have a certain time and every time i dont be in an ampt mood, i'm relaxed, but it happens often. Do anyone know if this anxiety or what kind it is or what should i do to reduce it and make it better, please i need help, its extremely uncomfortable?

Maybe it's something like asthma? I think panic attacks can only happen if you have anxiety.

Could be panic especially if it comes on while studying etc. Still I'd get yourself checked out at doctors in case is asthma or something else.