if you read what Andreas says about OP....he states not to do it longer than 3-4 minutes at a time because you can reabsorb the toxins you are pulling out if the oil is left in the mouth too long. so- you could have reabsorbed the toxins you had pulled out and had a reaction. the inside of your mouth are mucous membranes and very porous. just as the oil pulls out the mucous membranes can reabsorb if left in the mouth so long.