Sharp pain in chest daily for 2-3 secnds

Hi doctor, These are my symptoms from 1 year 1)numbness in hand and legs 2)from 10 days i am feeling sharp pain that comes and go in left chest when i stand or rest...now a days i am getting it while i was walking too. 3)pain in left hand shoulder 4)less sleep at night 4-5 hours...some days 5)i have excess dandruff in hair 6)i have acidity problem 7)some times i get pain in left ear. As I am having these symptoms from long time i went to hospital nearly 7 times..every cardiologist said..everything is fine after looking ECG and 2D ECHO reports...i have done my TMT test before 1 year and it is negative. But doctor when everything is good and normal. I dont know why i am having these pains. I am 23 years old.I usually think a lot about future.. like what is going to happen and who will stay. but now a days i am getting pain in left chest when i was standing or else walking.. please help me out doctor.