I have a similar thing that I have found is relieved when I visit my Cranial Oesteopath who realigns my spine, skull & jaw. One GP said psychological, one said muscular, my acupuncturist didn't speak english (so still no diagnosis), but he did alleviate the problem until I moved.
I have found it is further reduced when I do the following; Ensure I have an appropriately sized pillow, drink green barley grass & Vit C non acidic, every morning, drink 1 teaspoon of apple cider vinegar (organic) in a small glass of water at least twice a day with or without honey(organic) & pure water according to thirst (too much water can make mine worse). I don't know what medications you are taking, so you may want to check with your health care provider.
On a completely different level, I often dreamed I was in far away places and the symptoms were worse after a big night on the astral plane. If this is something that resonates with you then tell yourself to stay home before you go to sleep, put a shield, metaphorically, over your bed so your astral body can't leave, and see if it still happens. I did this for a week before I noticed any change. Another thing I do is reassure myself that I have all the capabilities I need to effectively handle whatever comes along in my life and visualise a healthy fully functional vascular system.