Only option for me at my workplace is either coffee (undrinkably bitter) or expired tea (tastes like rot). Did not have enough time yesterday to make myself tea for the next day and the shop where I buy energy drinks is closed. I extremely drownsy and my head hurts.
EDIT: Coffee is undrinkable to me, quality or not. The bitterness will just overpower everything.
You are likely experiencing drowsiness & headaches because you’re not getting enough sleep. Happens to me too when I get less than 7 hours of sleep.
Caffeine consumption also contributes to poor sleep.