Brainfog

I have already quit porn,fap im a daily hardworker and my most of time goes on working hard. The only thing that bothering me is brain fogging at a diffrent level. So, whenever im into deep thoughts i get brain fog im watching what im doing but my mind is not focused on that thing. Sometimes im watching straight into wall and thoughts popping into my mind. This shit is bad when it happens when u driving. Im aware im driving but brain fog happens and im watching just one thing straight on road. I know this happens for some seconds but this shit is not good for brain. Any suggestions how i can improve on this ?