That has to be miserable--so sorry!
I occasionally get those long, won't-go-away headaches. I find if I cut way back on sugar and salt, it can help, at least sometimes. But other times I think the weather can play a big part.
Sometimes I steam over boiling water, and that can help (obviously, be extremely careful!). Or I resort to sinus capsules, making sure there is no interaction with other meds. I have varying success with that, since I'm not sure what type of headache I actually have. I think it's trial and error.
Drinking lots of water sometimes helps me.
Feel better soon! Keep us posted.
(Ha--I remember that quote from Arnold (aka 'the pahty poopah' (remember that one?))