If you notice a pattern of ups and downs in mood during the month it could be your cycle. If it's out of control perhaps you need to get your hormone levels checked. I ended up going on a herbal vitamin supplement that balances everything much better. I used to go into a rage around PMS time. A long period of low moods could indicate depression. Hope you're feeling better today! 💖
It really depends, I had it pretty young, I believe 11 or 12 by some ladies are just late bloomers. What age did your mom get it? Sometimes that can factor in.