Why do I feel unreal with constant head pressure and brain fog?

Hello doctor,

I have been having a really strange problem for the past five months. I have been to the doctors and got some blood tests done with some CT scans as well, and they told me that they cannot find anything wrong with me. So I am beginning to think that this may be a mental issue, and I feel as though it is gradually getting worse. I have a painless, tight pressure that starts from the top of my eyebrows and ends at the back of my head, then I start feeling as though I am not an actual person for a moment, and I feel as though I am not real.

I catch myself just staring at stuff, and what worsens my issue is when I look at something, I feel as though I am not really looking at that specific thing. Like right now, I am looking at my screen and typing, but my brain just makes it feel as though I am not really doing any of that. I have also been very forgetful, and it has gotten so bad that I cannot remember the things that I did past a minute. I do not even notice or realize half the things that I do anymore, nor can I remember half the things that I do, and it just makes me really sad.

This all started a day after I finished drinking a flavored malt beverage, a 4.2% ABV light lager, and a soft drink all in one night, and I stayed up until 5 AM or so. I feel as if I am going crazy, and I am scared to die, even though I feel it is already too late.

Please help me.