Is it normal to have fibrotic changes to your lung after pneumonia is resolved? what symptoms should one expect? is there a treatment?

Yes: It is common to have areas of scarification after a severe pneumonia. Fortunately it is usually a small area of the lung that is asymptomatic that results. It's symptoms may include shortness of breath when walking but this usually may resolve. But the more episodes occur the worse it is. Smoking in the worst factor that worsens the occurrence of any lung disease.

Perhaps: After a severe infection of the lung, the chest x-ray may be altered. Fibrosis of lung implies something else (such as a genetic or rheumatologic condition). You should try to understand what your physician is telling you about your lung function. Perhaps you had a pulmonary function test to measure the breathing capacity. Time, avoidance of pollutants (smoke), and medications should help.