I'm an elite athlete. High intensity workouts leave me feeling incredibly tired, dizzy, and out of breath. I'm never hungry after. What is going on?

See your primary. I would go and get evaluated from your primary.Depending on the exam you could be completely normal and just tired from the high intensity workout so may just need to slow down or anemic,electrolytes abnormality,exercise induced asthma or cardiac,etc.You and your physician should be able to work it out.