I have trouble breathing, i feel like i have to work harder than i should just to get air. i asked my doctor about it but she said i should be fine..?

Trust your doctor: . . . But, if you haven't already done this, ask for an explanation of your symptom/experience. Sometimes people become worried about the functioning of their bodies. This worry can lead to a change in their breathing. This change in the breathing can lead to a sensation of a shortness of breath or smothering. This shortness of breath can lead to more worry. And the panic cycle begins. Ask.