I am 25 year old male student, I have done thyroid test and it is normal. I have sleeping problems and attention related problems, I also had hair fall problem I took treatment from dermatologist, their are positive results but they are not satisfactory, my feet feels very cold in winter and when I am in ac, I feel throbbing (like very fast heart beat, I can see skin moving) I have dark lips I don't smoke or drink or have any addiction. I am currently taking treatment from psychiatrist for anxiety and attention related issues. Can I have high cortisol even though I have normal thyroid? What test shall I do for checking cortisol?(there are many options like blood test saliva test, hair test, morning test, evening test)