I am 33 yrs old and last week I started having this sharp pain in my upper left arm. it was on and off so I didnt think much of it. Now this week I started having mild discomfort on my upper left side of my chest and it feels like it goes aroung to my back, concentrating mostly like under my armpit. This morning it changed and my back feels really tight and my left arm feels numb from my shoulder to the tip of my fingers,kind of like after your arm falls asleep. Should I be concern about this and go see a doctor?