It could be a couple of things. Anything other symptoms? I would not think the arm feelign heavy would be CT but I'm not a doctor. Cervical would be another possability. If I were you I would have it looked into. Not sure how long you have been experiancing this but if its been for any length of time or it getting worse & not improving its best to have a doctors opinion. Like with alot of injuries better chance of treating the problem the earlier its caught. good luck, Sammy