Periods are no fun and they can cause us a lot of pain and make us tired. Here is a dua for period pain and stomach ache.
Put your hand on the stomach and recite this dua.
لَا فِيۡهَا غَوۡلٌ وَّلَا هُمۡ عَنۡهَا يُنۡزَفُوۡنَ
(37:47) There will neither be any harm in it for their body nor will it intoxicate their mind.