So sorry that you are still experiencing pain; I understand how distracting this can be. I was diagnosed w/in 24 hours of symptom onset, by an exceptional dermatologist, and my eye doctor became a part of my treatment team. Even so, the neuralgia eventually spread from the upper right quadrant (eye, forehead) to the left, altho never to the extent on the second side as on the first. My worst symptoms declined w/in a year, but I continued to experience mild symptoms for as long as three years, and most recently as I write to advise you that you are not alone. Much less than a mosquito bite, but it is still there.
Perhaps, as my immune system declines with age, PHN will be an issue again. For your own treatment, I encourage you to pursue the treatment that worked for your friend, and to investigate medical trials, as well as to seek more than medical support for your pain. Upon referral from my dermatologist, I consulted a psychiatrist, and found that medications to reduce anxiety did not address the underlying cause of the neuralgia, but they did help me to sleep. This was discontinued when my symptoms ceased, but I recommend that you keep an open mind about the relationship of sleep to both pain and anxiety about pain.
Consulting a psychiatrist, especially one experienced in PHN, is suggested as one approach to benefit from a broader view of medications that may improve your quality of life, and also provide information about other medical trials for which you may be qualified.
Being clear about your wellness objectives is an important first step that you have already taken. I wish for you, wellness. I wish you well.