How old are you? Do you have any pains in your abdomen? My case started like yours, I was fine and then suddenly I started getting really tired and felt like I was mentally in a cloud. My work suffered dramatically. I had minor pain in my guts (that occurred sporadically) and usually went away when I went to the bathroom. I chucked this up to constipation. After mentioning this all to my doctor, he recommended me to a Gastroenterologist, who, after a colonoscopy and an upper endoscopy, identified ulcerations and inflammation in my bowels. I ended up having a weird case of Crohn's disease. This struck me as odd, because my guts never really were the issue (I was constipated rather than the constant diarrhea), it was mostly my head. But it turns out the Crohn's can lead to deficiencies which can affect your mental state, namely fatigue and cloudiness. After a month or so on steroids (endicort), I started feeling much better, although I am still no where close to where I was before this all started happening. The reason I being up your age, is that Crohn's usually starts in people who are in their twenties.
The idea behind it makes sense (like gaming survey data which results in useless analysis), but I'm unsure how it can protect the user from accidentally injecting malware from malvertisng ads. Seems like a dangerous game to me.