If you will try Excedrin for Migraines it almost always helps. I've done this for years on this forum and I've seen lots of people with sub headaches. The OTC Excedrin Migraine most always works. I know it sounds too simple to be true but you have nothing to lose but a headache. Try a couple first, if you have to take three, but that usually is the most anyone needs. Hope that helps. I agree the sub drs don't know what they are doing or they would know that a simple OTC medication like this most always works. Let me know how it works out for you. And I can help you taper off the subs properly if you need the help. God bless.
I am not a dr. My statements are based on years of experience and related education. Consult with the professional of your choice regarding matters of concern.