Can anyone help me with Aetna?

Well the insurance denied me today! The diet doctor that I have been going to for the past two year, did not note on the chart that we discussed diet and exercise, even though this is his program. They are going to write a letter on Monday to show that even though this is not on his chart, his program is diet and exercise, so the chart was not noted correctly per Aetna! I am so depressed... They say I did not meet the criteria for diet and exercise. I know this was just denied today but I need help on what to do starting Monday.