I thought it was when I tore my ACL in my right knee completely apart. Now that hurt. A lot. But, several years later I began having tingling and numbness in my left arm. It got bad enough that I finally had to go see someone about it.
After a quick question and answer period, the doctor decided I needed ultrasound-guided injection therapy. So he tells me to lie on my back and lay my left arm down, up above/behind my head. The doctor tells me I can watch on the monitor as he moves the camera wand around my elbow. I see my elbow on the monitor and he points out where there are nerves being pinched by swelling and he says “ok nurse give me blah, blah, blah” and she turns around with a giant needle. She passes the needle to the doctor and it disappears behind my head.
And then, without warning, he shoved it into my funny bone. The area of your elbow between the two bony parts that really hurts and tingles if you hit it. He stabbed the needle into that nerve bundle and shot the cortisone/steroid mixture in there. No warning. No “this might hurt a little” or anything. My whole body jolted like I was hit by lightening. I yelled. I cried.
Holy crap that hurt. That was the worst physical pain I have ever felt.