Small Follow-Up

So after I wrote that last post, I had a mild headache on and off for 24 hours.  Today, I reached the end of a bottle of 1% gel and rather than opening another decided to use the 1.62%, except that it was at my house and I was at my partner's place.  I figured, hey, there's not a big difference between 20.25 mg and 25 mg, I'll just use a whole packet rather than go over there in the rain.  It's been less than an hour, and I have a headache already.  I'm not very impressed with myself right now.