15 drops in an extreme amount. And I'm not even sure Jim Humble himself recommends anyone to reach a 15 drop dose anymore.
The new protocol says take much smaller dosages - but more frequent.
If I'm reading you correctly, you tried 3 drops of Miracle-Mineral-Supplement - then immediately jumped to 15 drops the next day?
That is way, way too much.
You need to build up to such a dosage for weeks and weeks.
Personally, I would not recommend anyone taking more than 10 drops at the time.
My advice would be to take 3 drops every 3 hours or so.
And do not do this until you've done 1 drop every 3 hours a few days, then 2 drops every 3 hours etc.