Carson is almost 2 years old and is breathing hard and his heart rate is 145-150. Is this normal? What should I do?

Go to a doctor ASAP . If he has a fever this may be normal response. However, with the limited information given I would advise seeking medical attention as soon as possible.
See doctor. His heart rate is not concerning (younger children have higher rates than adults), but if you feel that he is struggling to breathe, he should be evaluated by a doctor. .