Getting sick from kelp? ?

I have been taking 660mg of kelp in tablet form, I have been taking 7 tablets a day. My throat hurts and I feel sick. I don't think I have iodine poisoning because there is only 400 mcg in each tablet. I don't know what is wrong. I am a 19 year old girl and weigh around 120 lbs. I feel awful and I don't want to tell my parents because they will be mad at me for taking these. so I can't really go see a doctor.