Pretending you did 50 Vertical drops with 2.5 mg Iodine and 3.75 mg potassium Iodide (KI) per drop.
That totals to:
125 mg iodine
188 mg KI
Iodine in megadoses almost always gives me headaches, not so with KI. That's a pretty hefty dose though, what are you trying to accomplish?
It's been many hours, hope you're ok. Let us know how you're doing. Always drink plenty of water to flush stuff out. Salt pushes can help, so can Magnesium.
Eat plenty of antioxidant rich foods like fruits and veggies (choose different colors). Vitamin C and minerals work synergistically with I.