Extreme pain in my elbow?

i play softball and it started about 8 months ago i get pain in my elbow while/after playing softball. the pain got worse and worse. while im playing the pain gets so bad that my elbow gets stiff and i lose grip strength on my hand to where the point that i can hardly make a fist. also the pain makes my hand shake. the pain radiates from my elbow in to my bicep and down to my hand. ice only makes it worse, heat and advil help but they do not help longterm. can anybody tell me what this is?