Hi @Daisy_01,
Welcome back.
I have regularly heard of people developing tinitus on tamoxifen. I think @Brenda5 had a problem with it.
I don't have that problem but the light headedness comes and goes regularly. I had two brain scans, after about 8 months on tamoxifen, mostly for the cognitive dysfunction, but the dizziness was another part. There was nothing wrong. Can't help with the period thing sorry, last one of them was after my second round of chemo Feb 2017. What your describing is a pretty common occurance though, even a couple of years down the track.
All the best lovely. Try not to panic yet, I know it's hard. Try to enjoy your long weekend.
xoxoxo