Does anybody else feel terrible pain when someone pokes you?

I've noticed it first like 5 years ago. But if I'm poked or even using a back scratcher, my back, upper arms, and thighs feel as though I was just beaten. The pain spreads with creating an excruciating pain all over the area. Does anybody else get this? I've looked it up and found a couple of people who described it perfectly. But had no answers of why, or a solution. Please help if you have any REAL helpful info. Thanks.