Help anyone?

Anyone know what causes really painful periods? My periods since I first got them have never been a problem I always bragged that I never got a bad period, but over the last few years especially this year the cramps get really painful, that I’m struggling to sleep? I’m so angry I’ve got them cos I’ve been TTC for a year now and she came and showed her head and I’m so mad but can’t even think how mad iam cos of the pain, I got a positive on a test a few days before she came today aswell so I’m just all over the place with how I feel. Anyone advice? Opinions? Similar stories???