Headache

I am constantly having headache these past few days and so I end up doing nothing in a day. Shall I blame it to excessive heat? exhaustion? intense emotions? or unceasing thinking? Maybe all. I still have lots to comply on my graduate school requirements in a crunch time and I am wondering if I can finish them all or just surrender. But the cons is that I need to spend (not to forget "wasting") another time and money to enroll on it again.

I am worrying a lot now and this somehow lowers my energy to face each day, when I should be looking up on it with vigor. I better stop thinking with many things so I can stay relaxed and keep away from possible illness. I should keep fit!