Be careful and listen to your neck. I'm saying this from experience. I kept ignoring similar symptoms and would continue with heavy shrugs, etc. Now I have a cervical herniation and am recovering. This has brought on some weakness of arm and shoulder strength due to impegement of the nerves. First and foremost get it checked out by a professional. THen I would work on ice therapy and posture and reduce anything that is putting undue stress on the neck. Hope you get better soon.