Yes you could be pregnant or have viral stomach flu. See your doctor for a blood test.
yes.
no
Take a test
i havent heard they can but my gerbil wiffy's head was shaking for a while one time so maybe they can have headaches
there is a lot of reasons like you are pregnant or you have a problem so go to your doctor and find out if your not pregnant
It's quite possible.
no.
no, if you havent had sex.
No
yes, as long as you havent gone through metapause
Stress, change of life styles, it could be a many of things.
Maybe its because u havent got enough sleep or becuase you r skipping meals. Eat! Sleep!