Sometimes in places in which doctor makes an appearance, his role is extremely important while other times he functions not so much as a symbol but just as a doctor and there needs to be nothing more symbolic about him than what he already is. To have a dream about a doctor basically means that you have a lot going on in your life and it is beginning to take its toll on you.
If you have recently gone to a doctor then this can be one reason that you are dreaming of it. As we all know, the more time you spend seeing something in the day, the more time you'll spend dreaming about it in the night. If you go to the doctor a lot or if you have just recently gone to the doctor then this could be the reason that you just had a dream about a doctor. Fortunately though, we all usually have better immune systems than that, which allow us to go quite some time before we need to go to the doctor's office demanding that we be cured of all of our disease. If you have a dream about a doctor though then this very well can mean that you are in fact sick.
A doctor dream essentially just means that you feel like you need to get better in some way. You don't actually have to be sick to have a dream like this. It could just be that you need to get better mentally or change the way you think in order to make things easier for you. This is also quite possible and would make a lot of sense for you.
Your body can tell that it is sick sometime before the mind can, and likewise your mind can often tell if you are sick before your body starts to feel the pain from the sickness. So if you have a dream in which you see a doctor this might be an instance of the latter. Your mind is trying to let you know that you will become sick soon. As intimidating as doctors can sometimes be, a dream like this is more of an indication of a silly sickness like the common cold or a cough. You should be able to last fine as long as you make sure to watch your sickness levels though. If you start to feel like you are too put-upon or begin to feel like you are being hassled too much by your dreams then it might be a sign that you need to go out and get checked out by a professional. Otherwise you're safe to just chalk it up to a fluke.