Thank you Ricord for your advice I would email my PCP and ask her for a referral
That is a very low cortisol level for that time of day. It should be above 5 or 6. The medication you took the night before usually acts to raise the cortisol level, and yet you're still low.
You will probably want to go see an endocrinologist. I would call my PCP and ask for a referral right away, especially as you have felt so sick for so long. You need to get your thyroid, pituitary, and adrenal glands checked out.