i am 16 years old and have been haveing weird chest pains in my back and shoulders for a year ......

and my lower front of the ;egs irregular haeart flutters im scared and terrified i am going to die i went to a&e
six months ago they suspected pulmonary embolism !
sooo i had legs measured chest examineations .......
x-ray ....blood test and ecgs !!!!

i never have pain ...when i breathe in though ....but i get weirs pressures through my chest
I Get the feeling only somtimes i am not breathing enough air in ...
but ...im scared im gnna die no one will listen to me !!
pains in the lower back aswell but under my bra line around the back hirts when i move my shoulders really bad ....
Then i went back to a&e last week...where they did chest x-ray another ecg............
and blood test .....everything came back normal except my blood test clotted !!
sooo they couldnt test mt blood they said it happend all the time if blood is left out side for to long sooo its normal
now im convinced i have clot on the lung
butt could i for a year and a few months its way long the doctors said ....
its kind of bizzare in the end i had to sighn out of hospital !!!
cause i couldnt wait any longer it was real late the doctor said i didnt have anything life threatening and they aee
putting it dwn to anxiety ?

please write back pleasae