He just said it was to do with the steroid affecting oestrogen levels. I'm pretty certain it affects the hormones because that's exactly how I felt , very hormonal and periody (if that's a word ) I even said to my husband when I woke up the day it started, I felt like I was due a period, despite not having one for three years. I hope it doesn't cause you too many problems if you have to continue with the injections. I certainly won't be having them again unless it's absolutely vital. 🥰