Girls can get moody during periods.
I have severe cramps, fatigue and I sometimes used to pass-out when I was in school. I literally have to take leave at least 2 days every month. I had doctor’s certificate and I am really thankful that my school understood my situation.
Initially, I just thought that it was normal to get these symptoms. Later, found that I had some condition called as Endometriosis and I was treated for it. Now, my periods are way better. I wish I had gone to the doctor earlier, I would have escaped the pain.
Anyway, I would advise you to check with your doctor if the pain is too severe. Take care.