They can not tell you about the pain - the constant dull headache. (parkroadvet.com)
One of the most common side effects of a detox is a mild dull headache within the first few days of starting the detox diet, often due to caffeine withdrawal. (ericbakker.com)
Protein may counteract some of the negative effects associated with excessive stress, specifically the tryptophan content of protein may increase the brain's serotonin levels — excessive stress often causes serotonin depletion and this depletion of serotonin is one of the causes of symptoms like dull headaches, tiredness, irritability, feelings of anxiousness, sleeping disturbances and a heightened sense of pain. (ericbakker.com)