Ever since I was teen (I am a 31 year old male now), I have felt this fogginess. It is so good to hear other people experiencing it too.
It feels like there is a heavy fog between my mind and reality and it is accompanied by such things as slightly blurry vision sometimes, feeling very tired and sluggish mentally, disconnection to my self and reality, spacing out during conversations, getting extremely sleepy while driving, having no thoughts at all sometimes, feeling like the world is passing me by, tired feeling in my eyes, and it goes on and on!
I am pretty intelligent, for example 3.95 GPA in my college classes right now, but I feel like my mind works slower than most people and I need to be focused on a specific task in order to use the intelligence. Ideas don't just spark off in my mind like it seems like they do for most people.
I find myself "faking it" socially sometimes, just trying to come up with something to say that will pass the conversation on to the other person so I can respond to what they say because I feel like I have nothing interesting to say. But I have mastered this faking so much that people have actually told me I am great with people.
Some things I have noticed:
It never goes away, just a range of how strong the fog is.
Good regular sleep helps slightly.
Coffee helps at first but also brings it on worse when the caffeine wears off.
Nicotine clears my mind very much for about 5 minutes. I only smoke a cigarette about once every two months. This makes me wonder if high blood pressure actually helps in some way (nicotine causes it but not sure if it happens for one cigarette), because I normally have a slightly low blood pressure level.
I find myself eating sugary foods and drinking coffee all the time to try to get an energy boost to the brain, even though I don't want to (and they don't really help).
I feel pressure in my head behind my right eye and the right side of my head feels kind of numb. Obviously we cannot feel our brains, but it feels like half my brain is numb.
I was so freaked out about this when I was about 25 that I got a brain scan (no tumors!).
I have realized that I must move on with my life and learn to live with it and find workarounds. I set goals, set tasks, make myself do things, and try as much as possible not to focus on the fog. These things are most helpful--keeping busy, not letting myself think about it.
I take long hot showers and let my mind wander wherever it wants to go in the fog for as long as possible. This seems to give me a few hours of decreased fogginess.
I talked about my problems so much to my ex that I think it is one reason we broke up. Now I am married and talk about it from time to time to my wife, but do not over-do it. Being around other happy people really also help because for me I think the fogginess also causes some depression that leads to more fogginess.
Being in nature helps. I definitely still feel foggy out there, but I feel somehow better. I hike, volunteer in a community farm, or just sit in a park and relax.
I really really really wish the scientists and medical community recognized this condition, because it feels so lonely and there is not anything we can tell people we have. I have told some people about this foggy condition and most of the time I get the "it's all in your mind" response or basically they don't believe it is real. But it makes life a real struggle. Thanks to all of you for sharing!