last night 21 Feb 2018 left chest side

I was lying on my back,  left arm toward the fire station and I got hit at least five times on the side of my arm.I  looked for a bruise, slight tinge, , really really hard and am sitting down and it hurts right across my chest from left side , I walked over to my lock up that may have been when i got hit again. very much in pain whole left chest side. i feltt the  arm and that area /i was hit was hot to the touch, you have to remember the pulsed/shot  happened early morning ,,and this pain and heat was later afternoon.