Stressed and wired 24/7

Hi

I am new here in the forum and have a few questions to ask.
I am quit desperat since I cannot relax at all. My body feels like it is full of stress hormones at all times.
My heart is pounding hard, I am not able to breath properly because of tense muscles, my thoughts go round and round (mostly on my stressed body), I am unable to concentrate or work, have fatigue and depressions and I am not able to sleep without medication.
I have been like this for four years and feel like I can´t stand it anymore.
My cortisol levels have been measured twice with salvia tests, and boht times they were fine.
Can it still be my adrenals causing this?
I am thinking about contacting Dr. Lam, but he is quite expensive and I do not know if he can help.
Do you guys think this is just a mental problem or can it be physical, and by this I mean the adrenals?
Have anyone else experienced this?
And do anyone have any good tips for healing?
I have tried qi gong, breathing techniques, relaxing techniques and meditation without any help.
Hope some of you have some good tips for me!