i really hope you feel better soon. have you checked your blood pressure? once while trying to kill parasites my blood pressure went very high and stayed that way for a week. i didn't know it was high, i couldn't even think straight at the time, i wasn't well. but...aggrevating parasites can cause circulation issues (high or low).
lets hope it might just be that. that is how my head felt too, weird pressure. but very bad pressure.
if it is high blood pressure, dosing with cayenne can take it down within hours. don't take on empty stomach!
hope you're feeling better soon. thank you for posting, it's important information.