This is a personal research to gather informations about causes of headache based on personal experience.
Not to be used for training.
If you have a different opinion on info provided then i encourage you to make a merge request with explanation for change.
Dull pain and feeling of pressure seems to be caused by difference in environment pressure in comparison to pressure in invidual's head assuming that adult human brain requires around 20% of total body haul based on quick search.
Pluging up a nose and creating a slight pressure by exhaling and inhaling with close mouth regulating depending on feel in healty invidual seems to have positive effect on said headache. Reasoning seems to be that this procedure seems to normalize said pressure.
Seems that this air is beeing trapped in the invidual parts of the brain which needs additional verification.
Dull pain and nausea - Human body seems to increase a body temperature to deal with the infection.
Increasing enviromental temperature seems to have positive effect on said pain where hot bath seems to be the most effective.
Painkillers seems to have negative effect on the issue which needs verification.
Another causes of dull pain seems to be closely related to a bad sleep quality which can be confirmed by checking inviduals prapezius and deltoids.
Changing pillow and stretching said muscles might have positive effect on the pain it is expected to allow bloodflow in these muscles during the sleep.
Assumption of higher quantity of magnesium (110~130% of recommended daily consumption) seems to cause headache and nausea with dull stomachache. This doesn't seem to be lethal, but annoying.