Sharp pain in my elbow when I work out?

Someone

New member
Just about 5 minutes ago I tried doing some dumbell exercises with 20lb dumbells which I've been using for months, doing what I always do and after about 3 reps my arm I got this sharp pain in my elbow and I nearly dropped my dumbell. Do you know what this is? How long until I can work out again?

P.S. I give my arms a days rest and have a healthy diet. My left arm is my dominant arm. As far as I know I haven't stretched anything or overworked my arms today.
 
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