If it’s really extreme, I think you can get antidepressants to treat PMDD, which you can take just in the weeks leading up to your period, it doesn’t have to be all month. Otherwise, vitamin supplements can be useful, such as calcium, magnesium, B6, D and zinc, as well as nutritious food and exercise. I used to have quite bad PMDD, however now I’m on the pill I’ve noticed it’s significantly improved. When I did have it, I just tried to distract myself, wore baggy clothes, went out as much as possible, cleaned the house etc, and when I found it overwhelming I would put on headphones and loop a song I love. Just keep reminding yourself it’s just hormones and not a reflection of who you are, be kind to yourself, and try not to let it consume you. I always found that because of how periods are portrayed in the media, often with the sexist connotations that women are controlled by their hormones and over emotional, I never wanted to blame my mood swings on my menstrual cycle because it would conform to that stereotype, but over time I learnt to just ignore that and admit to myself that my emotions were often influenced by my hormones and that doesn’t have to be a bad, ostracised thing, and it made me feel so much better.