I took 5000 mg of biotin, i have severe headache.what do i do?

Biotin: Since biotin is a vitamin supplement, it's hard to know what else is in the tablet you took. Concerning symptoms for new headaches include: feeling like it's the worst headache of your life, double or blurry vision, nausea/vomiting, vertigo, numbness, ringing in the ears. If you have any of these symptoms, please make sure to seek care!

Drink a lot of water: Drink a lot of water to wash it out of your body. Check yourself in the hospital if your symptoms will get worse: blood pressure became unstable, dizziness and palpitations developed. Your treatment will be IV therapy with other supportive measures. Max daily dose of biotin is 30 mcg/day. You took more than 1000 times more. This is poison. Speak to your doctor and explain why it happened.