What is wrong with me?

i keep gettin this on and off uneasy feeling.like sometimes i could be perfectly fine and then all of a sudden my ears wud start to pop and feel great pressure over them,my vision would blur for a second r 2 and other times i get this heavy feeling in my chest and my breath would be alot heavier and id feel nauseated and just feel like i need to cry?i know its probably nuin and im being foolish but its really been freakin me out lately and my friends have started to notice as i cud be standin right next to them perfectly fine nd the next i start to lose my balance and sway backwards or i cud go to walk and lose my footing nd nearly turn in the oppsite direction?i dnt know if the two are related but id like to find out if this is normal for a 13 yr old girl?