Menopause after hysterectomy

Hi everyone! Next month will be a year since I had my total hysterectomy but with ovaries left intact. I was told that as my ovaries were left in that I would not go into early menopause straight away, but that It would probably start within the next 5 years. My question is, if it’s possible to start having menopause symptoms one year after the operation? I’m displaying a few signs of menopause, but not obvious ones like hot sweats. But my mood is so up and down all the time, and feel like I’m either really happy one moment and then in a raging mood the next for absolutely no reason. I just wasn’t sure if this was the start of the menopause or if it could be something else? Any help would be great, thanks in advance xx