Since you upped a dosage of a killing Herb at the same exact time as this happened then i would say it is def a Herx.
My Lyme sx did the same thing, they would rotate and switch in and out.
One day the slightest noise would be so loud and drive me crazy, and that would be the worst sx at that time. Then magically a few days later it would vanish and get replaced by a diff sx.
If the head pressure is still there, I would back off the dose for a few days until the pressure declines.
Another thing you might try is some oil pulling, this will help pull toxins out.
Take some coconut oil and swish it around in your mouth like mouth wash for about
15-20 minutes, and then spit it out do not swallow.
The battery footbath is also good to pull out toxins.
www.nenahsylver.com/make-foot-detox-bath-for--10.htmlTry to sweat 2x per day for 20-30 minutes, great for detoxing.
Activated Charcoal and/or Chlorella are both good to help remove toxins.