I have had similar symptoms the last couple of times I have used the pads - I was practically worthless the day after using them. I could not focus, etc. Felt progressively better as the week went on. It was almost like I was hung over. I did not know whether it was the brand of pads I was using or that I was just getting sensitive to them. From what I can remember, I felt great with the Shu Li pads. I don't remember the brand name of the current pads I am using, but they are much cheaper. Thanks.