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Avoid situations that causes anxiety or stimulate your fight or flight response (loud music, glaring lights, people. Rest, increase your sitting and standing tolerance, take cool showers. Find the correct medication management. Find a good medical practitioner who understands IST. My own doctor did not know about IST. I brought him litterature and had long conversations about medication management. I had to push to try SSRI's wich in the end changed my life for the better. It increases the serotonine in the body and therefore decreases the effects of adrenaline.