headache 3 days

[Nocturnal]

I got a low headache 3 days ago, and yesterday I lost my appetite...
What causes this...
I have a few suspects...

1. not enough fresh air ( I walk my dog 2 times a day one time takes about 20min)
2. not enough rest ( I sleep 6-8 hours a day. I don't have a stable sleep rhythm... I go to sleep around 11pm to 3am and wake up 7am to 10am)

[Antares]

I used to get migranes really often a few years ago. They are starting to go away.
I suggest taking tylenol and going to sleep. If it is still there, go to the doctor so they can check you out.