The pain you describe that radiates above your eyebrows or behind your skull base is most likely coming from ES & will probably stop once you have your styloid process(es) &/or stylohyoid ligament(s) removed. The trigeminal nerve is likely causing the forehead pain & there are several nerves that could be causing the pain at your skull base. Trigeminal neuralgia & even the symptoms of fibromyalgia have been known to decrease or be cured after ES surgery.
The symptoms of ES are caused by irritation of up to 6 cranial nerves that “live” in your neck in the same area as the styloid processes & stylohyoid ligaments. These are the trigeminal, facial, hypoglossal, glossopharyngeal, accessory & vagus nerves. Elongation of the styloid(s) &/or calcification of the stylohyoid ligaments can cause irritation of these nerves. Alone each nerve when “upset” can create painful & sometimes scary symptoms. When more than one is irritated the symptoms caused can be downright debilitating. Additionally, vascular compression of the internal carotid artery &/or jugular vein can occur which creates other miserable & concerning symptoms. Obviously, the solution for recovery is to remove the offending bones/ligaments so the nerves &/or vascular tissues can recover.
I must say that I beg to differ with your comment that there isn’t much that can be done about ES. As noted above, surgery to remove the styloid process(es) &/or stylohyoid ligament(s) is basically the cure for ES. There are dozens of testimonies on this forum regarding recovery from the type of pain & symptoms you’re experiencing once a person has recovered ES surgery. The success of the surgery does depend somewhat on the competence of the doctor doing the surgery & the type of surgery you have i.e. external surgeries are often more successful w/ quicker recovery than intraoral surgeries. That said, we do have a number of members who have had successful intraoral surgeries. Also, ES surgery done by an experienced ES surgeon can provide better results than if surgery is done by someone inexperienced. This is why we often encourage people to travel to the more experienced doctors on our list if it is possible.
There are a series of videos on YouTube called Two Minute Neuroscience. There is one video for each of the cranial nerves. In two minutes, each video covers the location, function & symptoms of dysfunction of a given nerve. You might be interested to watch these as they will better help you understand the cause of your symptoms.
If you need a referral to an experienced ES doctor, please let us know & we’ll be glad to give you some names.