i still get a lot of headaches as i'm working through this detoxing programme and some of your symptoms to do with pulsating/headaches i can relate to and maybe shed some light on.
for me it started mainly when i started colon cleansing. a lot of pulsating which is not sinus related per se and frequent headaches which come and go with some other symptoms. it is definitely related to the body detoxifying. the pulsating feeling i think is related is to the lymph and in a good sense that drainage is occuring. there is far more lymph fluid than blood in our bodies so it is going to feel like a powerful circulation if it has been congested and trying to 'fire up'.
my headaches do seem to accompany things being tighter and blocked up in general though.
do you have any immune system related symptoms? anything autoimmune related like a skin condition? i believe the headaches may well be related to the level of toxins being released as the lymph starts to pump again, which in my own case is immense.