Shoulder has been hurting for months when i throw a ball(of).mri recently done and shows nothing wrong. should i get a cortizone (hydrocortisone) shot? other ideas?

Why not?: I think a steroid shot and physical therapy would be a good option. Labral tears are sometimes subtle and difficult to see on mri. I think if the cortisone and pt do not resolve your symptoms, a shoulder scope would be a reasonable next option.

Second Opinion: Before moving ahead with any treatment i recommend you have a firm diagnosis that makes sense to you rather than treat the mri. Consider a second opinion first. Learn more here: http://www.Theshouldercenter.Com/shoulderpain/2013/shoulder-surgery/spur-acromioplasty-impingement/.