I should mention that Carbo veg. is also a possibility, as it is a 2 in the rubric, headaches from lack of sleep, a 3 in the rubric
headaches, occiput; it's not represented in
thirst, extreme; but, is in the "thirst" rubric; also, it is present in the rubric: Headache, constant; as is gels., which someone else guessed.

We all know gels. has the occipital headaches and heavy eyelids. Not known for thirst, though.

Snoopy