I have had brain fog for nearly 7 years. I didn't quite know what it was until a friend got me to smoke weed and "relax." I felt the exact same under the influence of the herb as I did normally, just amplified. My speech is very impaired. I used to have some of the best memory of all the people I knew, and now I have the worst. I have trouble becoming angry, I usually just feel sadness. (Which is completely different from when I was a child) My thyroid looks normal with the exception of an elevated TSH (4.8). Blood pressure was 110/48 and my BPM was 61. Drinking more water raised my blood pressure, but the overall feeling stayed the same.