Pain below tricep but above elbow

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for the last month or so, i have been having this pain in my left arm (none in my right arm and I am left handed btw). It is located right below the tricep (at least the horseshoe part of it) but above my elbow. This started slow and was still able to lift but with slight pain. Well, last week I was unable to do curls or any bicep exercises of any kind without pain. So i figured the best thing to do would be to let it rest for a week. I let it rest for a week and a half and went about tryign to lift again last night. Well, lets just say it didnt help and was still unable to lift without pain. Anyone have anything like this before and could maybe help without having to go to the doctor because I do not feel it is that serious yet? Thanks for any help!