Anyone else have hypothyroidism(thyroid disease) and just suddenly stop taking their levoxyl/synthroid???

ive only been out for a week or two now..... as far as I know its not deadly to be without the medicine.... and I want to see how I do without it...............instead I have been taking kelp..is this a bad decision? I have had a lot of dizziness and fatigue.... causing me to believe I have gallstones or something.