Lugol's new user question

I just started Lugol's 2% 4 days ago. I'm doing one drop a day. I've had severe muscle pain and fatigue. I was so miserable yesterday I didn't do the one drop. I did do it today. I did the salt flush and it only slightly improved the pain and only lasted for about 30 minutes. I'm taking selenium the other supportive supplements. Is this just something I have to deal with? Does anyone have any ideas? I can't just sleep all day again tomorrow, I have to work. Thanks so much in advance.