Hi Sarah. This could certainly be bronchitis or even pneumonia, especially after your recent surgery and bleeding episode. The mucous may be narrowing of the airway, or there could be an element of asthma (e.g. asthmatic bronchitis). This type of condition often requires antibiotics and inhalers. I would suggest you get an appointment with your GP or visit an express care clinic for proper evaluation and treatment. In the meantime, a mucous cough syrup (exepectorant) might be helpful in terms of keeping the airway relatively free of debri.
If you develop fever, chest pain, or shortness of breath you should be seen right away. If not, and you are eating and drinking and funtioning more or less normally, you can wait until the morning. It is not likely to get worse, and if it does it will likely do so slowly...assuming you are in good health otherwise.