Shoulder injury. Should i go to?

I was involved in a car accident 2 yrs ago. I was in the backseat and the accident caused a jerk reaction in my right shoulder. I used pain relief spray that time, and a pain relief ointment as well. After a few days, it felt normal again. However, one day while working out and doing pushups, the injury recurred. I was not able to move my shoulder properly for 15 days. Then again, I visited my family doctor and not a specialist. He prescribed some medication along with pain relief ointment. That helped me somewhat. But after this incident, I feel uneasy whenever I start working out. I feel that there is always a niggling pain in my shoulder. Please help me with this. I need to start working out again in order to stay fit. Which specialist should I go to?