There's a variety of reasons why a headache can last so long. One of the main reasons is stress. You may feel overworked and just feel the need to take a break. Maybe, take a few hours to just rest and just put your worries aside. Sometimes, it can be triggered by being on a computer for too long, and would just require you to take a break.
Staring at a computer screen requires your eyes to adjust to constantly changing pixels, which can be overwhelming for a prolonged period of time. If you take a break for a couple hours and it doesn't stop, you should check for other symptoms such as a fever, nausea, etc.
This is only to see if you have an illness. I'm not an expert in your condition, since there's so many factors that can lead to a headache, but my best advice would be to just rest it out and take the time to let your head unwind.
Well, today I got another headache today at around 1, and I had a 102 fever. I got home and take a nap with a cold washcloth on my head, lol. I felt much better when I woke up.
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