From a British born American Citizen.
(1) Brexit (however dreadful) is not the end of the world
(2) The stockmarket is not the economy,
(3) The economy is not the stockmarket.
(4) Do not allow Brexit to move your attention away from Climate change, and from Global warming, and from overpopulation, and from diminishing natural and food resources, and from the pollution of the land and the oceans, and from rampant international militarism,.
(5) Do not panic - that plays into the hands of the oligarchs and the oppressors.
(6) Continue to work for justice, human rights, environmental integrity, and against the world-wide oppression of girls and women and human trafficking.