26 y/o woman, exercise 5-6 days a week, 16% body fat. sometimes after i exercise i have heart pain, dizziness and shortness of breath. is this normal?

Some concern: These symptoms deserve to evaluated by a physician. You are young and seem fit, but the combination of symptoms listed could indicate a cardiac issue. Please discuss with your primary doctor.

Heart pain: Heart pain should be evaluatate by a cadiologist it is normal to feel some chest senstion and shortness of breath with very intense exercise. Questions to consider: does it recover quickly, does it radiate? Does it stop you from exercising.