Has anyone experienced this feeling? Head pounding and feels like it's gonna explode?

I experience this when straining myself to lift heavier weights as I recently increased the weights I'm lifting.
I'm a gym goer for more than 4 months, 3-4 times per week.
I noticed this feeling comes when I'm reaching my limit. e.g. midway through 3rd set of the bench press, 10th rep of the chins up (Im currently doing 13 reps), etc
however, I don't feel anything when doing leg/ab exercises, or maybe the feeling is negligible, seems limited to upper body exercises.

The only instance when I experienced this is last week, when I was feeling under the weather. I stopped working out that day when I felt this as I thought it as only because I was not feeling so well.

Any advice on this before I consult a doctor?

1. I don't actually take note of how much I drink but generally I drink the same amount of water every time i exercise
2. yup, rested over the weekends
3. no
4. no

but i'll take a rest for a few days and see how it goes

breath in when relaxing muscle, breath out when contracting.
is this the correct way?

no to both