I just registered on this site because the nature of the headache all of you described fits my condition to a tee! Except, my migraines have not reached the level that require more than Pseudoephedrine, usually. But, recently, I had one that lasted for seven days. Additionally, a lot of times, I can feel a trace pressure that runs from the eye and sinus, down the back of one side of my head and into the base of my neck. Usually 2-4 times per month. But, I had a suggestion for any of you who have access to a large number of massage therapists. . . I recently found someone in my area who does a specialized type of massage therapy. My own term for it is "muscle sterilization", but he himself would call it pain therapy. Anyhow, this man studied under some researchers who developed foundational studies on the muscular skeleton using cadavers, and he does a type of massage that resembles deep tissue, only it is continuous direct pressure on each muscle knot/area of scar tissue until the tissue relaxes and gives way. It is extremely painful (about a 7 on the pain scale of 10), but once the scar tissue and knots are broken up, one can achieve quite a bit of relief. I have seen him for one month, and he has actually isolated the nerves that are causing the pain over my eye and in my sinuses. I have changed the way that I do certain things in my work or hobbies (anything that requires me to look down such as reading or sewing, I have elevated to a level that doesn't require a lot of strain on my neck, and it seems to be helping). Anyhow, if any of you have access to this kind of massage (it might take you a while to find one, but it wouldn't hurt to go through the phone book), it might help you quite a bit. I have found that for those of us who concentrate deeply on a task, we tend to forget what position our bodies are in, and this often adds undue pressure on neck muscles, causing pain.
I have also noticed that my migraines virtually doubled this past year, after I married my husband, who likes to drink beer every evening with his dinner. I didn't drink it a lot before we got married, but when he moved in, I didn't mind enjoying it with my meals too. So, if anyone hasn't considered the effects of even just one drink per night, you might.
Wishing you all luck, hope this helps.