It seems the use of certain psychoactive drugs (including alcohol) tends to cause/aggravate certain problems, like pressure in your head.
I fooled around with add medications (dextroamphetamine) to focus while doing complex work (although the buzz got the better of me). I became addicted and started using improper amounts for up to 2 weeks at a time, with extreme sleep deprivation, as a result.
After a few more runs like that, eventually I developed sudden pressure in my head. I was foolish enough to keep using the add medication, despite this, and now after quitting, I still have the pressure in my head every day. For two years straight i've had this every day, every minute of the day!
I notice any time I use any psychoactive drug, the pressure in my head gets worse. I think a lot of it has to do with frequent constriction/dilation of blood vessels, which affects your sinuses (or so I think.)
i'm only now beginning to think that sinus pressure causes this sensation of blockage/fullness in my head.
In your case, I would go to the doctor to see if you have a sinus issue, which may be causing lightheadness (i get this too), and also the pressure.
For 2 years i've had this problem, perhaps now I have discovered that sinus cloggage/inflammation is the root cause?
And of course many drugs (psychoactives especially) aggravate the condition.
Let me know if i've been of any help, and keep in touch!
