It seems to me that the problem you have is a neurological one. You have already pointed out that you have gone through quite some extensive eye tests as far as I understand so I suggest nothing is wrong in that area.
I am not an expert on the subject but it seems to me that you have an irrtation of 1 of the sensoric nerves of the face, at least that is the direction I would look. (e.g. Nervus Trigeminus). When you put your hair in a ponytail it will activate the hyper sensitive (due to irritation) skin around your eyes (stretch of skin). I am though a little worried about your medical care shopping because it becomes unclear actually what did help' Yoga? Chiropraxy? Massage?
The problem is with having a cocktail of treatments you don't know what worked for you. To give an example, let's say it is mental stress related, Than would assume yoga and massage would help. Let's say it is physical stress related then chiropraxy would help.
Apparently your Gp nor you have really looked into the possibility of a neural irritation which could be benign e.g Cranio Mandibular Disfunction or a loose filling (amalgan working as a battery) of a tooth.
You mention that when you read you have loosened the ponytail but maybe already the possition you are reading cold cause problems in the area Nerves coming from your neck C0-C2 (in between skull and 1st, 1st and 2nd, and 2nd and 3rd vertebrae). So to enable to be helped you have to eliminate what did not help