For two days now, I get a stinging sensation on my upper left chest. Almost right where my nipple is. Then, my left thumb and pointer finger begins to have short pains and stiffen up and goes away. I m 33, 145lbs, 5 4 woman. What is this? Currently taking 20mpg. Of lexapro. Would love an answer, but cannot pay. Looking for a similar QandA to help me.