pain in arm

I have a pain in my right arm. The best way to describe it is kind of like “growing pains” in my arm. The pain is powerful enough to keep me up at night and it hurts in the part of the arm from the elbow down to the wrist. It’s wierd because I had the same pain in my left arm a week or so ago, but it wasn’t as severe. It seems to have moved from the left arm to the right arm and now the pain is 100x worst. I am 28. thanks for your help