Tingling fingers after picking grass?

It's either a plant you're allergic to (which I suggest going to the doctor for - my mother was just weeding the garden one day and almost died due to a bad reaction with a plant), or you were pulling on the grass so much/so hard that it hurt your fingers. I used to always pull grass out of the ground, and sometimes you just do it too rough. But still, I suggest you at least get it looked at.