There are a vast number of symptoms one can attribute to anxiety, but I personally have never heard that itchy skin or scalp tightness are among them. Have you changed your shampoo/conditioner/soap in the past three months? That MIGHT account for the itchiness and tight feeling which I would blame on dryness. That this apparently happens only during sleep is a bit of a mystery to me. Anxiety is a 24/7 disorder. In my humble, non-medical opinion, I don't think you are dealing with anxiety. I'm sure there is STRESS in your life with the closure of your business and I would be inclined to put your symptoms down to that rather than anxiety. Check with your doctor about the itchiness and have him/her check your scalp.
Peace
Greenlydia